Also keep in mind that you're missing out on many other arguably essential tools such as debuggers, smarter shortcuts, and other static analysis.
Therefore, yes, I think it should be expected of a programmer to pick the right tools for the job, in the same way that it can be expected of a designer to be able to work with Adobe files.
If classic VIM doesn't offer these features, then it isn't sufficient as a code editor anymore.
It's not just a matter of whether they're available, it's a matter of whether it's a fair expectation.
I've been developing for a decade and never found that I'm "missing out on many other arguably essential tools". Typically I'm as productive or more productive than my peers.
I get that you think usage of these features is a fair expectation. Can you provide your argument for why you think that's a fair expectation?
This seems like a case of assuming the conclusion, tho. Whether a text editor-based workflow is as productive as an IDE-based workflow when avoiding feature that advantage the IDE doesn’t impact on whether the IDE-favoring features are valuable enough to adopt and assume everyone has access to.