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As others have mentioned, it’s simple things takes alot time finding/figuring out.
I use GIMP within Ubuntu MATE few times a week to edit pictures. Simple edits nothing major.
One of the thing I need regularly is to highlight certain part of the picture.
Now in Microsoft Paint I can draw a rectangle, choose its border thickness, and color in 2 seconds.
I have learned how to do the same in GIMP few times but it took alot of time and I still forgets after few weeks.
So now I just reboot the PC and log into Windows or use Windows virtual machine and draw rectangle in 2 seconds in Microsoft Paint.
Mine is extremely simple use case, so I can only guess how difficult or how time consuming it would be for actual professional to create artistic work in GIMP vs Photoshop (or in similar commercial software).
Just my 2 cents.
Though I use Tubular (NewPipe fork) and don’t need a timer but, always sleeps faster listening weather report of a remote country.