32" 3840x2160 monitor with 1.5x scaling enabled is equal to a 32" 2560x1440 monitor.
32" 2560x1440 displays have the same PPI as 24" 1920x1080 displays (92 PPI).
MacOS has flawless scaling since the first retina Macbook Pro. What you are describing makes no sense to me...
some apps aren't optimize for it
It’s done by macOS and shouldn’t be something the application notices, can you give some examples of applications which don’t work well with scaling enabled?