Why TV manufactures are pushing massively UHD TV in the markt ?

i found a technical reason for that .

If you have a UHD TV and you want to play 1080p Video , the besting you do is disabling the upscaler of your UHD TV and then you have the real 1920x1080 . HD videosl is giving the best and real Quality only on UHD TV .
I bet what you want , UHD TV is designed for 1080/i /p videos ; Do not buy a UHD TV if you want to play 2160p videos … for 2160p you should buy 8k TV .

Thank U