>Convert pdf to png. Assemble multiple images into a pdf. Quickly share with someone else over chat. Normal productivity stuff.
But I don't really know what to say: I very much do prefer the cli! Even if it takes some trial and error, finding the right script that does exactly what you want gives you a reproducible and concise record of your alterations, so if you are in a position where you need to make, say, 100 images with similar annotations, possibly from a csv file or something, you can just do it! Also, it's lightweight, it's a comprehensible process, you know exactly what you are doing, rather than in some alienated userspace where you can never be sure.
I won't argue anyone "wants to", but I know what I want I think!
Pinta [1] is a lightweight MS Paint type program with broad support and a BSD license. It just works.
It seems out of whack to complain about linux without investing a wee bit of time with cli.
but it's not the car's fault if people don't want to use keys to start them up.
anyway, there's a huge amount of GUI software to handle PDFs in Linux, I will say that Linux gives you the most options, either as free software and close source ones.
Hell Acrobat is gold on WineHQ!
But for those who do have the patience and understanding for the shell and man pages, well they can become more powerful than the other Oses combined!
Edit: also, I bet doing an rclone mount of your Dropbox will be pretty seamless and stable, havent tested this personally though [2].
If you don't like the command line interfaces, then yeah you are probably better off with a Mac.
1. https://imagemagick.org/
2. https://rclone.org/dropbox/