The question isn't "is frontend simpler than backend?" (which I don't think is as simple as you make it out to be). The question is "can LLMs replace frontend developers?"
I think it's a bit like Squarespace. The lowest possible tiers of developers will be replaced. Anything complex enough to be beyond the scope of a hobbyist isn't able to be replaced with an LLM.
lol I wish. The problem is not the inherent complexity but the accidental complexity. FE has a big chunk in the second. You won’t get your budget to rewrite three accidental complexity you find in the wild
BE requires a lot more context around microservices, database, reverse-proxy, api-design, etc.
A signal that makes me correct is the number of BE vs FE at a big company.