Most developers have never seen anything better. They start working within an artificially complicated ecosystem, get used to it and perpetuate all of the assumptions the ecosystem makes when they create their own products.

And when you point this out, most people just get angry, because for them it suggests they have been doing something wrong for as long as they've done engineering. This is why you always hear things like "buy my website is an application" or "but it has to be complicated to use, because it had complicated functionality".

Simplicity is not easy or intuitive.

I've only started to learn the principles of designing simple systems that do complex things around 10-12 years in my career, after accidentally discovering certain people's talks online (Alan Kay, Rich Hickey) and learning a bit about old-school AI systems. Most people aren't familiar with any of that stuff and don't really care.

One thing I personally cannot comprehend is why web applications are almost universally installed and managed through command line, rather than web interfaces. The only advantage of a command-line interface is pipe chaining, and it's never uses installation/configuration. There is nothing fundamental about command line. It's just a software simulation of a teletype terminal.