Welcome to you both to this forum! 
I have my FP5 since June 2024.
No issues with the performance.
@ThinkPol: Never experienced anything like your behaviour. Though I never used Bliss launcher for longer. Presently using Pear launcher
@squidf: From my perspective e/OS on FP5 is mature.Though, if I read through the forum certain use cases seem to be not satisfying. If you are unsure in respect to your specific use cases / apps, perhaps make a search.
…installers shoot messages stating FP5 is not compatible with them…
This has nothing to do with compatibility of the phone as such. Only that the easy, guided installation via the installer is not supported (yet?; plenty of discussions in the forum)
Edit: perhaps this helps
kind regards