Targeting specific servers sounds like a problem of centralization, not fragmentation. If hosts can just easily move to new proxy servers, and users can easily create new accounts on any random server, then I don’t think the Fediverse would be easy to target. The direction that a lot servers are going, with having to type a paragraph to join, seems like the opposite direction to me, and it makes me appreciate this server more.
The linux motto to any problem is “it’s possible, but here are the pitfalls”. You can do almost everything on linux (unlike windows), but the tradeoff is it can sometimes require more time to learn and troubleshoot issues. In my opinion, linux is great for those of us who dislike to use the mouse and take our hands off the homerow. Get used to using the terminal to launch apps, instead of clicking stuff on the desktop. Learn keyboard shortcuts. My recommendation is to use a window manager like i3 with an i3 status bar at the bottom. This will give you a minimal desktop, where you can move windows/tiles around all with keyboard shortcuts. Open apps with something similar to dmenu, where you just have to press a keyboard shortcut and type the first few letters of the app you want to open, and press enter. Learn vim-like keyboard navigation to edit text and reposition the cursor through the text all without the keyboard. Linux integration with this style of experience is vastly superior to Windows and Mac.