Great overview! I think 1Password's Linux support has been improving [0]. I use 1Password with an Ubuntu desktop and have been happy with it.
There are also sync issues (items created in the desktop app won’t appear in the browser extension unless I restart my browser), which aren’t occurring under Windows nor macOS.
„Poor“ Linux support absolutely does the situation justice.
I have some internal tools at work where you need to specify the domain, and some where you don't. Having two separate entries for these scenario is annoying, as I gotta update the password on both when I change it.