Yeah, this falls well short of Sketchup's intuitiveness.

Every interaction I try on KetchUp has some kind of gotcha. It doesn't snap to grid by default, and as you say, it's insane that I have to name every rectangle. I can't extrude a face with a single click-and-drag of the push/pull tool; instead I've got to select it first with the arrow tool (which strangely does not match how the Move tool behaves), then extrude. Also, clicking and roving through the File/Edit/View/Tools menubar doesn't interact as expected.

Sorry to say, this ain't SketchUp. It seems like yet another flashy vibe-code that has fulfilled an 80% quality level but crumbled on the final 20% of polish that really makes or breaks the user experience. Really feels like the author didn't test-drive it for usability.