How bad is a CURVED DISPLAY smartphone?

Never used a curved display smartphone but was always fascinated by it.

I'm urgently looking for succesor of my dying Galaxy M21

I have couple options like Realme GT 6, OnePlus 12R

But both of them have CURVED screens

At first i thought its ok but after reading few problems that curved display smartphone users feel I'm reconsidering my options

It will be very great if you could contribute by mentioning what ALL problems you face with curved displays 🙏🏻