We don't ever use the term 'full stack', but at my place of work we are expected to be able to learn how to make changes to everything - our legacy Delphi application, JS frontends, & JVM lang services. Some people are better at certain things than others, of course, so in that way we still have specialists.
The important thing is that people will always help others where they can. Identifying experts really helps with this, so when a question I can't adequately answer comes my way, I know exactly who to point to.
I don't think it's useful to constrain yourself to 'front end' or 'back end' - all dev work can get complicated in its own way, but I think anyone can learn enough to get by in any language, in any situation.
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