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The point being that all of those topics are a potential area to deep dive. The previous poster is disappointed that not everyone happens to deep dive on his specific area of interest, while there are likely a hundred areas other people are experts in that he has not done a deep dive for.

Given time you will come across almost all of them. And you're expected to rapidly pick up any gaps you may have in that list.

For the simple reason that on most teams, there's no other person.

It's a pretty fair list of things I have come across in my career. As lead, it's my job to know at least generally about all these things, and for many to have deep experience and intuition into others.

The breadth of my frontend career has only kept expanding over the last 10 years, it's definitely harder than when I started.