Plus Gimp just works and its interface isn't that bad. It is far better than many modern apps that just don't have any significant functionality. I mean perhaps Photoshop is better in some ways, but it is not worth it to put up with Adobes Creative Toilet if you don't produce some specialized prints.

Krita is awesome too and does interfaces right as well. Bought it on Steam. But I still use Gimp since the use cases are different. But it might perhaps be worthwhile to put your open source project on Steam anyway to make some bucks. I would happily buy more.

Blender did make huge jumps in recent years. Suddly you couldn't even update as fast as they introduced new things. It is amazing by now but I would argue that its functionality was unfairly derided in the past while it was already quite capable for quite some time.