You're not wrong, but I hate the idea of an entire generation growing up without ever using a full powered computer. (Full powered is the wrong word, more like fully capable computer)
We have an entire generation who only knows how to interact with "usability optimized" interfaces with zero friction and zero learning curve.
Not knowing how to use a regular computer creates a barrier to entry for programming and other computing industries that didn’t exist before.
I get it, there's now definitely a hurdle between "I got a computing device" and "I can program on it". I don’t think it's a huge hurdle though, you can and will be able to upgrade or just buy a full computer when and if you encounter its limitations.
Your car can't compete in races, but it doesn't affect you because you're probably not interested in racing. You're more interested in comfort and price.