The best ones where basically everything works as intended are: OnePlus 6, OnePlus 6T, Xiaomi POCO F1

I have a OnePlus 6T and the only missing pieces are calls and camera. Both work, but not reliably yet. Everything else is pretty much there.

I tried the all-in-one server Mox two years ago and it just worked. In fact, I’m still productively using it to this day.

The spam filter could be a little better, but it does a good enough job IMO.

Thank you all for your ideas, I managed to solve the problem. It was somewhat hardware related, but not really.

I was using BTRFS, which creates a lot of write amplification and aged SSDs don’t handle that well. According to a study from 2017, btrfs can cause up to 32x write amplification, absolutely hammering its performance: https://ar5iv.labs.arxiv.org/html/1707.08514

I converted my system to RAID0 using EXT4 and the stutters and freezes are gone.