Sure. But I think that's also true in capitalist America (or, at least, in my / my friends' experience in tech) - at least in the sense that it's much harder to get your current employer to reward you for your own increases in skill than to put the increased skills on your resume and start interviewing elsewhere.

I don't know any system (other than perhaps a carefully planned and unusually benevolent and well-funded central economy) that rewards people for the opportunity cost of increasing their skills, as opposed to the increased output gained from using their skills - one advantage of this system is that it's very clear that if I use my skills more efficiently or in a way that helps the company, a portion of that reward will go to me whether or not I can prove it to management. If I save my current traditionally-capitalist employer $1M/year due to cleverness, I'd expect to see $0.00 of that. I'm far more incentivized to get good at writing self-reviews that portray the things I'm already good at in a good light than to learn the skills to, say, optimize our AWS spend.