I tried it. Lot of fun and fustration. If You hava spare machine and few weeks to play around, do it. It boosted my knowledge and my skills a lot. I would not use it for daily driver, and never for work.
Documentation is super! If You have to do something by hand, it is one of the best source of info!
All this true and I relate. Firefox is a beast. Compiling browser is a pain. Don't even tought to do KDE. I put together the ui with some suckless tools and had fun with them. Security, stability are a constant question with a system like this. Not a daily driver, used to gain a deeper knowladge. It is like bivaking behind the grandarents house in the foresst: uncomfortable, adveture, goodway to test Yourself and the gear, still have cookies. Not preparation for the alien zombies in the Amazonas.