Gimp is I think a more challenging comparison to its proprietary counterparts than the others you listed unfortunately, but I appreciate and agree with your sentiment here. Ui/ux is such a big part of where foss creative tools struggle, and while some are better than others, its a difficult thing to improve because there's a lot less design talent in the foss world than dev talent. And ui design for large creative software is REALLY a hard design challenge, its not as though the design skill involved is trivial

Anyway, I think inkscape no longer opens a blank document anymore, at least with fresh installs. Maybe for older installs it keeps the old behavior? You should be able to switch it to a nice little welcome splash with document templates and recently opened files if you'd like :)