> Spreadsheets are a fundamentally important tool

It's nice to know that you use spreadsheets all the time.

I use them rarely, and often end up regretting that I didn't write a real program instead. And I'd definitely never see myself using one on a phone; it's too painful to type, and the screen is usually too small.

I'd guess that maybe one percent of mobile phone users have spreadsheets of any kind installed, or would want them. Maybe.

What I'm getting at here is that you seem to have a pretty skewed idea of "fundamentally important".

Admittedly an awful lot of mobile users do have a lot of game and eye candy apps that have no F-Droid counterparts. And some users have professional apps that also don't have F-Droid counterparts. But spreadsheets aren't the center of the Universe.