Bashing #Apple ... number 473 in a series.

Why, oh why, does macOS only enable HiDPI mode for certain monitors?

I recently bought one of those cheap portable monitors to use when I'm away, and connecting to my MacBook it looks great at native resolution (but it's 2560x1600 so text is too tiny!) and the other resolution is 1280x800 ... which looks good but modern apps assume larger real-estate, so it's not usable.

Switching to other mods left a blurry mess ... until, the BetterDisplay app! Which, for the most part, I'm just using to enable HiDPI mode on the display... and now it looks great at 1600x1000!

Why can't i do this without a third-party app?