Java vs. Full Stack

Question

At a same senior level, what would a java developer necessarily know that a full stack developer could get away not knowing?

Answer 1

Note that this is not about the difference between a senior dev and a full stack... I was wondering about what a senior java dev knows that a Senior full stack does not always know (assuming the same level of salary in the same company, say)
... or is one always a subset of the other?
I have a personal opinion but would like to know what others think.

Answer 2

A senior level developer Congo through the entire process of developing an application an will dos efficiently. A full stack developer isn't necessarily a senior level developer and the only difference is that over time they will get better and become more efficient / create more efficient applications.
senior level developers can specialize in front end or back end or both, however I believe that they at that point would have the knowledge to be a full stack developer.
I wouldn't focus on what you could get away with not learning, knowing how to develop for front and back end are equally important.