Mainly kernel level anticheat, though that is obviously not really linux fault.
My other personal gripe is probably stumbling across a GTK based app that works for what I want it to do but clashes extremely badly with my Plasma DE.
For example, I wanted to set up automatic file backups to an SFTP server using borg. The two common UI interfaces I found are vorta and pika-backup. Vorta only supports SSH and local backup repositories while pika allows SFTP through some kind of compatibility layer with gvfs.
Seems like pika is the right choice for me but the UI felt incredibly dumbed down and really did not match with anything else on my PC. Since both programs were kind of out, I found another backup tool in Kopia.
The reason I was looking for a backup tool at all? I was previously using synology active backup for business, which is available on all linux distros except arch.
I know you didn’t mention video but if you think you might want to host jellyfin in the future, make sure your CPU supports hardware decoding for modern formats.
For example, my lenovo mini pc with an i5-6500 has support for h265 but not h265 10bit or AV1, which makes playing those formats on some devices basically impossible without re-encoding the files.