That's not to say it's perfect. There was a pretty bad bug maybe around 2 years ago where upgrades just stopped working and without any warnings. You had a notice the issue and run a special command to fix the issue. I've also had quite a few AMD/kernel regressions recently that resulted in artifacts in the desktop and AV1 video decode.
I wish there was like a Debian but atomic that has broad support like Fedora does. Though I did see that openSUSE leap 16.1 introduced an immutable option.
Have you subscribed to Mozilla VPN?!
How about your Canonical Pro subscription?
If anything Linux gave me more grief.
It's not like Flatpak is perfect, but at least it uses primitives that we understand through containers, and can apply to already existing programs. Even though they were written without playing in the sandbox and might expect full access to services and files, we can fudge it for the most part with bind mounts and open up safer doors through Portal and widget toolkits over time.