I don't believe Photopea https://www.photopea.com/ is Open Source, but it's a free web-implementation of Photoshop.
Photoshop, itself, is rather general purpose, but if you have a more specific need (like digital painting or photo management and retouching) there are other tools better than Photoshop out there.
Vim community can be very friendly and open. Vim is fully scriptable and there's plugins for literally anything you can think of.
Core is conservative, but changes are made, all with backwards compatibility up front.
And it comes over as a snobbish, generalised 'look at those nerds, they have no idea how to build software, let alone listen to me who knows exactly how it should be done'.
Who hurt you at vim, or in the opensource community that you feel you have to be so haughtily towards them?