All technologies aim to make some certain aspects of things "simple". But all technologies end up being hard once your problem space gets bigger than the space

All technologies aim to make some certain aspects of things "simple". But all technologies end up being hard once your problem space gets bigger than the space the technology has successfully made simple. And real world situations are always bigger problem spaces than any technology can map to a simple solution. Sure, HTML and CSS are very simple to get started with, but they get complicated and hard pretty quickly. Just like almost every technology. I think maybe the one class of technologies that this doesn't apply to is academically functional programming languages. I don't think they are simple to get started with. But once you do obtain proficiency with them, the difference between basic and advanced usage isn't as large.