I personally love WebP and other innovative formats, I don’t wish them dead, because better compression saves time and bandwidth.
However, for saving stuff on my computer, like you, I would tend to go for more supported formats.
I’m mostly just sad that it takes so long for new formats to be widely supported.
I love Grist!
My wife and I were frequent Google Sheet users and since a few years ago we started using Grist a lot. We tried some other alternatives before, but none of them felt even close to right for us.