If you think that solving all the problems CSS attempts to solve is simple then you probably only understand 5% of CSS.

Complex problems often have simple solutions but it takes a lot longer to get there than it does to create a complex solution.

CSS is like a second draft. We can do much better.

Simple is relative. CSS is far too complicated and ad-hoc for what it does.

But coming up with a simple solution takes much longer than coming up with a complicated one; and by the time you've come up with your simple elegant solution, your competitor has already beaten you to market with something worse but was actually "good enough" and no one cares about your solution. Worse is better is not a methodology, but an observation.

I have made this longer than usual because I have not had time to make it shorter. Blaise Pascal

Plus, I had to be done in ten days or something worse than JS would have happened. Brendan Eich

I certainly agree with that.