I think there's just no single good answer for this. Up to 2560x1440 on a 27" screen I much prefer bitmap fonts. Above, for e.g. 3840x2160+ at the same physical size I think vector is better.
I used to prefer bitmap fonts too during the transition period. But after using vector fonts for years, it's hard to look at them now. I don't even use particularly high dpi screens.
Either way, I think for default the dev should just go with the norm (i.e. what is popular for the majority). Users can always change to bitmap fonts if they want.
