You can always turn off scaling if you have to use legacy app I think, I would be happy if I have such an option on os x
I understand. However, I am more then sure that Apple is not going to introduce DPI scaling of this kind. They made it fairly clear. With some issues, one needs to make a strategic choice. Apple made their — which is agains arbitrary DPI scaling, and it makes a lot of sense. It's a shame that its not the choice you would have preferred.
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Yeah osx have so perfect scaling that I can't buy 34 inch monitor with 3440x1440 resolution as I'm almost sure I would have to return and the same for 4k monitors.
OS X support of 4K monitors is amazing, as it treats them as proper HiDPI output targets and offers higher-quality subsampled rendering modes (just as on a Mac with retina screen). As others have pointed out, you can force the HiDPI rendering even on low-DPI display (e.g. wie SwitchResX).