You would probably be decent at frontend if you did it at least 20% of the time. Obviously you can't be an expert at everything, but there is enormous value in being able to work on most things end to end instead of having to handoff every time.
I do it about 40% of the time - I'm just straight up not good at it, which is okay. I can get by, but it would be better for the company for somebody else to be doing it. Specialization can be good!
