To be fair animated 3D modeling is a complex task so the UI can only get so simple. Even commercial tools require training and have challenging interfaces.

Another example is Gimp. People like to bag on it for having a terrible interface, but when they say Photoshop is so much better I have to wonder what magical version they are using. For me the differences between the two are marginal, but that may be because I learned how to use Gimp first and have to hunt around Photoshop's interface more.

> To be fair animated 3D modeling is a complex task so the UI can only get so simple

The interface doesn't have to be simple. What it should be is conforming to established UI patterns and conventions. Blender used to be incredibly unintuitive even to people who had never used any other 3D modeler before.

Some complexity is of course an inherent part of the domain, and you can never truly get around it. At best you can stick to sensible defaults for the basic user and initially hide the most complicated parts until they are needed.

On the other hand: there is no reason whatsoever something as trivial as drawing a circle has to be as complicated as launching a rocket in GIMP. It certainly doesn't lack the technological scaffolding, and UX-wise people would already be ecstatic if they just cloned how 30-year-old version of Microsoft Paint did it. So why doesn't it have a Circle Tool yet, despite the massive amount of requests for it? The only possible explanation left seems to be an active disdain towards basic non-technical people: the UI is hard to use because they want it to be hard to use.

GIMP fought against single window mode for ages despite the majority of people wanting it.