I'll try safe mode and see what happens. But I've never experienced this total meltdown of little to no Wifi, web pages not loading, or loading, but just for a few seconds, then disappearing. And I'm not quite sure that only developers who create apps for Macs, that may serve to optimize memory usage, or sync/store files, like Dropbox, have no knowledge of the inner workings of MacOS, but those who write apps filling the AppStore do. And if Apple's own apps, like Safari, & iCloud, or it's own system of memory allocation, etc, worked really well, consistently, there'd be no need to seek 3rd party apps.
But sadly, I sometimes have more issues with Apple's native apps, like Safari, iCloud, iTunes (or whatever it's called this week), etc. than I would expect from those that should be of that oft-touted "seamless integration". Yet, I do recall that for at least the first ten years, maybe more, of the nearly 30 years I've used Macs exclusively, they definitely worked more smoothly, and calls to support were far rarer, and those calls usually resulted in fixes, unlike today, where too often they can't provide a fix, or diagnosis, or will even hang up when faced with an issue beyond their "genius level"...
And you say we should remove all the non-Apple virus screeners, speeder uppers, optimizers, cleaners, app deleters, & VPNs, OK, so where are the Apple ones that do those jobs?