I vaguely think my cheap college laptop display around 2006 was 1080 lines tall. How can it possibly be that some manufacturers haven't moved on since then?
Cheap 2006 laptop? Would have been 768p at best, maybe even 600p. Even Apple would happily sell you an 800p macbook (https://en.wikipedia.org/wiki/MacBook_(2006%E2%80%932012)) until 2012 and laptop GPUs of the era would struggle with a 1080p desktop.
The point of HiDPI is not having really small text, is doubling the scaling so text looks smooth instead of a pixelated, blocky mess.
I thought it was a gimmick in 2015 before I got my first MBP, these days I can't go back and have my eyes bleed on 96 dpi. You don't even need full Retina, my 27" 4K screen looks gorgeous at double scaling.
>150 dpi monitors are the second best tech upgrade of this millennium after the SSD. Yet, there's still people these days that will try to convince you their 5400 rpm disk is fast enough, just because they have never experienced modern hardware.
Resolution doesn’t change physical text size. They’re independent. It makes text at the same physical size more readable. Which sounds like what you want?