Ha, ok! I get that, I guess I think there’s more logic behind it than they’re sometimes given credit for (and not 1/2 as bad as some of the newer companies/designs).
Back to the original question - it’s simply a matter of economics, they’re cheap so not a lot of financial outlay for beginners, and secondarily not a lot of space needed. They make the sounds people associate with genre X or electronic music in general without too much fuss. Whether or not they’re really good for “beginners” is kind of hard to say since there are all kinds of beginners who can find their way in via different means. Even mid-level hobbyists and pros have different wants/desires.
Somewhat cynically I see it as just being a way to sell to people as part of synthfluencer culture. I agree with many of the same points OP makes but have no idea if they can be applied to any set of beginner or other level of musican/noodler/sound designer/whatever.
Edit: My first drum machine was the Boss DR-202 which some consider to be one of the worst Roland boxes, I didn’t know any better and was perfectly fine with it. At the same time I was learning “synthesis” on a Yamaha CS-5 and other cheaper analog synths.