Yes front end developers do more, than when the web was just html and tables, but that’s just evolution.
You want to focus on the UI only, UI developer fits. With complexity increasing, web developer title doesn’t make sense as it is too generic.
But backend, being it in java or node is a backend. I don’t see the need for this new categorisations.
I think the question arises from Fullstack term usage? fullstack front end and fullstack backend has been thrown around in job interviews, so fullstack alone without context doesn’t make sense: I don’t think it ever did.