I don't have a problem with spreadsheets personally. Complexity is bad; it's best if it gets the job done.

My issue is that they're very bad to use on mobile. It just feels off - like when the first smartphones arrived and you had to zoom in on every single website because they weren't optimized for small screens.

Additionally, you lose a lot of portability. My most recent example of this is discovering that macros don't work on mobile while trying to use a sheet that relied on them.

I would maybe even pay money for a better spreadsheet, or even DB frontend user experience on mobile.