There's nothing stopping anyone from acknowledging the bug _and_ offering a workaround. That's the best of both worlds. The complaint here seems to be about responses that dismiss the validity of the bug report based on the existence of a workaround.

It's totally valid for the maintainer of an open source project's response to a bug report to be "I don't care enough about this use case to fix this bug", but the courteous thing to do is to be upfront about that.