For years one of my pet peeves about desktop Linux was that they weren't careful about font metrics and you might have 75px of horizontal space with an 95px wide label in it. (It's gotten better)
In the Unicode age who knows what you'll break. Just having a terminal where line drawing characters work is something you can't take for granted at all and you never know when some Chinese characters are going to show up. Nice to have something tuned that "just works" as opposed to being able to set your system font to comic sans for pure vaingloriosity.
Why not have both? A sensible default for people who share your preferences as well as the ability to change things for people who want something else seems reasonable.
Man, I miss that thing.