I think your points are fair, it is a bit fiddly, I just enjoy how little friction there is to getting started and making something simple.

I just needed to make a couple adjustments to an STL this week, I haven't done any CAD in months, in principle I have used Fusion before and had a nice experience with it, but since it's been a while I don't remember any of it and would have to look at some reference to get back into it, with tinkercad I could just drop the model in and make the adjustments I need by playing around with the shapes they provide. It didn't feel very "precision engineering" like but sometimes it just needs to be close enough.