I want to love these, mostly because they're FOSS and Office/Google Spreadsheets seems to get more and more bloated, and subsequently slower.

But the UX is just a lot worse, and it isn't easy to go from one application to another because they're slightly different enough that your productivity takes a hit from all the small papercuts.

I'm waiting for some FOSS spreadsheet solution that doesn't just try to copy Office, but comes up with something better. Then it'll feel like it's worth it to learn a whole new program and its UX, rather than just suffering through it because you wanna use FOSS.

Yes, but take OpenOffice off the list, development has slowed to a glacial pace and it’s close to abandoned in favour of LibreOffice, which is actively maintained.

Looks like there was finally a OpenOffice release recently but that was after years of people complaining of security vulnerabilities not fixed in the release version.