Not necessarily, ASE is has a smooth UI that people like and as long as you're fine within the constraints.

This one is great since it allows for in-editor previewing of "weird" ideas, I know I've re-invented that UV-mapping workflow shown with the skeleton on the page once for a game-jam and wanted to use it but skipped it in the end since asset-creation was "annoying", having support in an editor to preview it easily can be a game-changer.

You mean ASE is more focused? Both look quite smooth, but PixiEditor seems to have more features (which inevitably leads to less focus).