Why should I buy 4k oled instead of 1440p?

Hi guys,I’m going to buy a oled monitor.Today I went to see some oled monitors.I was curious about the quality of the text.1440p text did not bother me.For 1440p I’m thinking aw2725df or msi 271qpx.For 4k its fo32u G80sd or maybe fo32u2.Why should I go with 4k if text doesn’t bother me?I use my pc more for gaming and studying.Nothing to do with text too.Is fo32u2 matte? Or worth 400-450 dollars more?I care more about the warranty and the longetivity.I didn’t buy a pc yet but I’ll go with 7800x3d and 4070ti super or 4080super.Im going to use my pc AT LEAST 6 years without upgrading(maybe I can upgrade small things but not cpu monitor or gpu.