Naming is hard, and I already have to implement file management :P
Just kidding. The reason is that I started the project mostly because I wanted a file manager with proper Material Design, and it's very unlikely that I (or AOSP) adopt a completely different design system.
Yes, and this app adopted it as well. There's a toggle in app settings for Material 3 v.s. the old Material 2 right now, and there used to be one between Material 1 and 2.
I used to love tinkering Android phone and always kept up to date with the newest app possible, and I remember having a Material Design being a major selling point at that time
Just kidding. The reason is that I started the project mostly because I wanted a file manager with proper Material Design, and it's very unlikely that I (or AOSP) adopt a completely different design system.