Despite all of its privacy concerns, one can’t really get rid of it if everyone around is using it as the default communication mode, unless you’re a social outcast. The thing with communication apps is that they aren’t a personal choice.
My path is similar to yours except went from Ubuntu to Arch. Haven’t felt the need to look for other distro since I moved to Fedora (GNOME)
With First Party Isolation is place, containers now add up very little to your privacy to be honest. They are mostly helpful in convenient compartmentalization of your browsing activities without actually having two different browsers.
Firefox is already very privacy focused, and its default settings are pretty good.
Partially incorrect. There is unnecessary telemetry that you would prefer to get rid of, for an example there is a setting for extensions recommendation as you browse. Also, probably because of their deal with Google, Firefox defaults to Google’s location services even though Mozilla has its own. You may want to change that as well for better privacy. I am only citing a handful few examples, there is more for you to dig in. uBO is a must have with right set of filters enabled according to your own privacy threat vectors. There is a reason hardening is a common practice among Firefox users.
But sir all I see is OpenBSD
For an example, Mozilla being forced to use Google Location Services as default even though Mozilla has its own. I am also a Firefox user but it always makes me wonder what other TnCs forced on Mozilla as part of the search deal.