@Samfir I used to prefer smaller devices (though that was partly due to costs at the time) but thought I would like a bigger phone now. Therefore I was weighing up the options on the S21 Plus and Ultra. Seeing as there is not a big difference in screen size and I viewed the Ultra as superior I decided to go for that one (some discounts made it worthwhile)
Anyway perhaps it will take a bit of time to get used to but personally I feel the benefit and the S10 seems small to me now 😁. I do tend to use the One Handed Mode occasionally but and have not really had many problems anyway.
I personally would love to have a small flagship smartphone 🙂 There is also the issue about phone UI is designed for right handed people (And I'm left handed ). So there are definitely benefits to smaller phones.