Libretube would have replaced the youtube app for me if not for how slow their instances are for me. So far I did not see any crashes but the pages would sometimes not load and would require you to change instances. I think the cause may have been that the instances are hosted far away from me geographically and that my current internet connection has been having issues for non-mainstream websites.

I have two Xiaomi devices and use custom roms for both of them. While there are pages for them in the XDA forums, most of the new updates and developments of custom roms and kernels, at least for Xiaomi devices, happens within telegram groups.