They're just going to make more work for the real developers who have to constantly fill in the lack of understanding about how the back-end works.
It isn't a limitation. It's a prerequisite. You wouldn't want a bus driver who's never driven a car before.
And if design systems ever evolve to the point where you can just click/drag some buttons to design a UI then that's the day the value of that profession should rightfully drop to zero. Lowering the bar that low only leads to vulnerabilities by blurring the lines between amateur and professional. Honestly the design crowd gets too much credit as it is.
Look at manual machinists. They have legitimate skills that only come with experience. They demand righteous salaries for those skills. BUT CNC machines have all but destroyed the need to employ manual machinists so instead you spend more on your machine up-front but you save forever because you can literally teach anybody with a pulse how to run it. The result is you have countless experienced and skilled machinists who are unemployable in today's market and a bunch of cheap amateurs churning out barely conforming products for $10/hour.