The reason you think frontend is more complicated is because of historically terrible terrible decisions made. Frontend is made complex because of the initial idiots developing it.

I didn't make anything up. I just noticed that frontend devs were being looked down upon when talking to some devs and I investigated further. It seems that most frontend devs are just what is usually called "code monkeys" who just fling shit until it works. No real understanding of math, algorithms, architecture and general good engineering principles. Which is also why usually frontend code looks like garbage. I am sure there are exceptions but for the most part frontend stuff doesn't get the best and brightest people working on it. Because it's considered boring and uninteresting. Personally I don't care. Web dev in general seems to be complete and utter trash and I work on things that are on a completely different plane of complexity (as in if things go wrong people die). It's just funny that you still cling on to the idea that frontend is some sort of holy grail of engineering and absolute complexity.