I've had problems with scrot and drawing selections, so I've been using maim for a while, otherwise: yes, exactly my kit - but for IM's convert I have to search for the syntax every damn time, it really sucks.
I use this script to help with selections:
scrot -a $(slop -f '%x,%y,%w,%h')
Quality and simple tools do exist if you look for them:
- Image viewer: feh
- Screen capture: scrot
- Dropbox: Syncthing
- Converters: Pandoc, ImageMagick
- PDF viewer: zathura
- Media player: mpv
etc.
Granted, some of them are CLI only (though they might have GUI wrappers), but desktop users with productivity as the main goal should learn to use and not fear the terminal, instead of settling for whatever their popular brand of distro decided to package for them.