Does DPI matter, or is it just EDPI?

There is a bit of a difference in for example

3 sense ingame and 1600 DPI
6 sense ingame and 800 DPI

I use mostly 5.20 and 800 DPI, would not go over 800 DPI because it just feels weird. But that is me.

Point is if you lower your DPI by 50%, do it also with ingame sense 50%. And you somewhat have the same.