It's not windows fault the apps don't take advantage of DPI.
You can also disable dpi scaling for individual apps.
It's "not Windows fault", sure but it certainly makes it a worse experience than other platforms like OSX where multi-DPI is much more commonly supported.
I mean, I get it, same issue as Vista for Microsoft - people expect 100% backwards compatibility, but it turns out that terrible design decisions made many years ago tend to mean you need to break compatibility. Just like UAC, resolution scaling will be an issue that becomes less painful in Windows over time. Right now it's not great, however.
Just most apps chose to ignore it, the developers took the 'anyone uses 96 dpi anyway' attitude and at the end of 90's most applications started to suck at 120 dpi.
I guess people got lazy, as you say.
No point in spending time on logical pixels if it makes almost no relevant difference...