HOW DO I FIND APPS WITH INCOMPATIBLE EXTENSIONS

Here you go: How will I know which software needs to be updated?

I found that by running this command in the terminal, you get a text file in which there are written all the non-Apple's kernel extensions currently running. This command is helpful when trying to address the problem.

kextstat -kl | awk '!/com\.apple/{printf "%s %s\n", $6, $7}' | open -ef

Find processes by name:

lsof -c processname

Find processes by PID:

lsof -p 123

This works for some things:

sudo fs_usage | grep dev

for /dev/ files or similar.

lsof | grep "/Volumes/VolumeName"

From an Applications -> Utilities -> Terminal session you can issue the following command to see what 3rd party kernel extensions your system is currently using:

kextstat | grep -v com.apple

You should always wait a few iterations of a new OS to get the bugs worked out, that's likely a year from now!

No need to worry, but to see them, just don't upgrade to 10.16 if the developers don't have updates...

About this Mac>System Report>Software>Extensions, click on Obtained from Header, all that aren't Apple are Legacy.