Not saying your typical frontend engineer is flawless either. It's probably true that they're, on average, not as skilled sw architects as backend engineers, simply because a lot of their work focuses on details instead of architecting, and, again, the HTML/CSS/JS stack is incredibly flexible, in good and bad.
For example, we all got stunned by the machine learning people. We have to pay attention to everyone.
I think in the age of AI we'll see more concentrated teams since everyone can hit up AI and do anything. It's going to be very important to build tight teams, and I don't think it's going to happen by continuing our factory farm level recruitment.
Listen, how impactful LLMs will be largely depends on the type of code teams are writing. If you're already building in a highly declarative manner, where your libraries are automatically handling most of the glue for you, then you may not have much of a need for writing code more quickly. These are the teams that are actually fast. Teams that already spend a bunch of time writing glue code will likely see significant improvements in velocity, because LLMs are good at regurgitating existing patterns. What they probably won't do is refactor your project so that your team starts operating on the level of the formerly described one.