Actually no, the web interface is really slick. I would not install a desktop app for it even if there was one.
i am trying to figure out if there is a business case for a desktop app. there is plenty of open source and commercial systems more or less similar to cockpit, and it's hard to compete with free
I'd rather have a client-only app that connect through ssh and get its data from standard binaries installed on the server.
So, yes. I'd give that a try.
I think I'd like some kind of alerts on some specific events (disk space, some logs, IDK), systemctl management and status/reporting, some instantaneous “update as I type” filtering/searching in logs, cron and/or systemctl timer management, space usage graphics, booting reports, etc. ... maybe these are just things I usually do and think a GUI would be nice to have if I had to do it for multiple servers. Not enough experience with that in a professional setting though so take it all with a grain of salt.
But as-is, I think I could justify asking for 50 bucks for the product if I needed it.
Looking at the logs is how this tool was started. This in itself is a failrly involved chunk of functionality. It'll be a year, probably, before I can release even that.