Kernel panic - Sonoma 14.3.1 - MacBook Pro 16" 2019

That Kernel Panic report mentions a page fault which usually tends to be associated with hardware issues, usually memory related which is what @Grant was saying about all the different crash reports. I was hoping it was going to show something else, but I think it better confirms a hardware issue with the Logic Board as I thought due to those "ProxiedDevice-Bridge" panic reports and knowing the MBPro 16" (2019) model has a high rate of Logic Board failures with these types of crashes. I know that is not what you want to hear.

Now you have to decide if it is worthwhile to spend money trying to repair this laptop or put that money towards a new laptop. Personally I would put the money towards a new laptop since a Logic Board repair is very expensive & the replacement board is just as likely to have the same issue at some point. It can be very hard to convince Apple to repair the laptop unless it fails their service diagnostic since most techs don't have any idea how to interpret Kernel Panic logs. I saw another post earlier today where someone had their same model laptop repaired and it still had a Logic Board related failure where they were having a hard time convincing Apple to replace the Logic Board again (like you they didn't really have any software installed that was likely to cause the problem).

You can try creating & running a bootable Memtest86 USB stick to perform a longer more thorough memory test than the Apple Diagnostics perform, but even Memtest86 may not be able to detect a memory failure even if the memory is bad. But if the Apple Diagnostics or Memtest86 report an issue, then it may make you feel better about our diagnosis here. As @Grant mentions, a passing result does not mean the hardware is Ok, only that no issue was found during testing. Memory issues many times are intermittent...I've run memory tests 24/7 for days before an error may occur, other times I have replaced the bad memory stick by trial & error.

Sorry for the bad news.

Save that report!

You will need it to help convince Apple support have an Apple Specialist DIRECT an Apple store or service provider to replace your mainboard (with the RAM soldered on it.)

I recommend you NOT go to an Apple service provider COLD, as they do not read such reports and will run their diagnostics and tell you your Mac is fine.

Official Apple Support

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Then there is the question of whether that money should go toward repair of this Mac, or move on to a newer model.

Provided you are not running virus scanners that crash you Mac "to protect you", when you see a lot of kernel panic reports that seem to be for unrelated reasons, and "all over the map" that suggests a NON-Trend.

A NON-Trend correlates strongly with RAM memory problems.

MacOS slightly randomizes the load point of key routines on each startup, as a hedge against fixed-address attacks. This causes a marginal memory cell to move into different routines each time your Mac starts up. This causes random and bizarre non-correlation in your panic reports from one run to the next.

Consider running the User diagnostic. It finds GROSS issues. A report of ADP000 says that in the extremely limited time it was run, using a constrained set of tests, it did not find any defects. That is a far cry from "All is Well"

the list of diagnostics reports in the etrecheck report is in reverse chronological order (newest at top). The 17th was certainly a tough day. When a group of them occurs, I believe the most recent is noted and a repeat factor (e.g., 5 times).

if the issues are even somewhat resolved, then you should not be seeing new crash reports there when you run it again.

Unfortunately the Kernel Panic log summaries don't include any useful information. Perhaps post several of the Kernel Panics logs here so we can examine them for clues. They should be located in "/Library/Logs/DiagnosticReports" with file names beginning with "kernel" and/or ending in ".panic". If there are none in that folder, then check the "Retired" subfolder.

I'm concerned you have a bad Logic Board due to those "ProxiedDevice-Bridge" panic reports since they are related to the T2 security chip which controls everything on the system. The Logic Boards of the 2019 models have a higher rate of failure, especially the 16" model.

You can try a DFU firmware Revive which resets the T2 security chip & system firmware to see if that makes any difference.

How to revive or restore Mac firmware - Apple Support

Ideally when you perform a clean install, you should test the clean install thoroughly before installing any third party software and before restoring from a backup. Since you have so much Free storage space available, you can create a new APFS volume and install a fresh copy of macOS into that new APFS volume so you can test whether you still get those Kernel Panics and "ProxiedDevice-Bridge" panics. This allows you to test a clean install without any third party apps or restoration from backup while still being able to reboot into the main system to do your work when needed. It isn't a perfect test since the file system could be bad, but if it crashes you more than likely have a hardware issue. Just make sure to give the new APFS volume a unique name so it doesn't conflict with your main boot volume......maybe name the new APFS volume "Sonoma Test".

I am extremely skeptical of Microsoft Defender.

I think it may be protecting you by crashing your system, so that none of its hallucinations can damage your Mac.