Full arr stack makes life much easier. Only time I got that look was when it pulls a .rar that didn't automatically extract. Wrote a script that transmission runs on completion and they extract when finished now.
I've had a bunch of issues that totally belong on the right side of this graph. Broke the nginx proxy trying to add a rule for a game server and can't access the arrs anymore. Subscribed to a list that had too much crap on and it downloaded everything and filled up my drives. Buggered up permissions somehow so sonarr can download the files but I have to extract it manually with ssh
Two of my private trackers have client and version requirements and transmission 3.0 was the only one on both if I use a VPN. It's the Debian of torrent clients.
I think Transmission is a very competent client. However, when I last used it a few years back, as soon as you reach 1800+ seeded torrents it really struggles. I switched to rTorrent but experienced similar issues at around 2500+ torrents. After hours of tinkering (which rTorrent / ruTorrent does have a lot to tinker!) and not getting anywhere, I made the switch to qBittorrent which is still happily chugging along seeding 4500+ torrents.