I haven't worked in the frontend in quite a while, but when I interact with it, the problem seems to be that is written by a lot of inexperienced people, so it's full of rookie mistakes which make the tech debt even more unmanageable than the backend. Given that performance is more relevant to deliver a good ui in the frontend, unless you are going to but the devices yourself, the poor code ends up being a problem, so more people are hired to fix it, executing the vision of the more senior devs.

Given the situation with hiring, this might be good and still give some space to junior devs to exist. But I could be wrong and AI could be doing already a better job.