Yeah, me too. It is quick and easy. I use SyncThing for things I want to keep synced.

I run CalyxOS on FP4, and I like it. It also has FP5 support. As far as I know, mobile Linux distros like postmarketOS work on (at least) FP4, but key phone functionality is lacking. There’s a functionality matrix on their wiki.

This is what I use. Replaced my old Fitbit Aria 2. I weighed in on both scales for about a month, and it was consistently 0.15 kg below, which is good. The body fat measurement was a bit more off, and it varies almost nothing over long periods of time, but I don’t really trust those measurements anyway.

I believe you can set up the scale in GadgetBridge as well, but I have not tried to do that.

I use ledger. I have not automated so much outside of autocomplete macros in my text editor, but it doesnt’t take too much time and forces me to look over my spend, so I like it. I will eventually attempt to build some kind of Dash-application for visualisation of the output, but have only started on the parsers so far.

Jellyfin is also useful for music collection. I tried both it and Navidrome to start with, and ended up only using Jellyfin.

There are some periods where YouTube make changes frequently so that e.g. FreeTube stops working for some time, but for the most part it works reliably well. I would say it provides a much better convenience than watching on youtube.com logged out, as you have profiles, subscriptions, playlist and history. Including adblock, sponsorblock and dearrow, and granular control over what to show or not (comments, shorts, live etc.).