I don't care if you use/like flatpaks, everyone should use their computer however they want, but treating flatpak as THE solution to package management is retarded.
>Size
It's an objective fact that flatpaks take a lot of space. It doesn't matter if (you) don't care or it doesn't affect you, the issue is still there. Installing even a small program like a calculator will take hundreds of MB, for a mere calculator. Call me poor or whatever, but I hate that everything nowadays is bloated, and the only excuse you hear is "disk space is cheap!1!". Hell, even without flatpak most modern programs already take lot of space, why would I want them to take even more?
>But flatpak programs share libraries!
Except when they don't. Last time I tried flatpak, some programs would install different "branches" of the same libraries, because one of the programs would update its dependencies pretty quickly, while others didn't, so now you have multiple versions of the same libraries taking more disk space, which iirc aren't automatically removed and stay there. So you end up with
>org.some.bs v47 400MB
>org.some.bs v48 410MB
>org.some.bs v49 500MB
Ironically, having these duplicates creates a larger attack surface since now you have "old" libraries installed in your system.