So at the end I took the risk, bought the Surface Laptop and tried Unreal Engine on it. The result is that it runs fine. With mobile rendering preview it runs stable capped 60 FPS in the 3rd person template project and that is all that I need.

Yes, that is the one I mentioned in my post. It looks alright, I am just checking if I find any confirmation.

I am afraid there is nothing like minimalism when we talk about mobile phones. It is basically all or nothing. I mean, it seems like everybody only thinks about social media apps but I don’t care about social media, I want my phone to run apps that control my smart home appliances, contain my public transport tickets, my ID card, my air tickets and other such convenient stuff. Most of these apps basically only exist for iOS or Android and some of them only work when downloaded from the official stores. So any phone achieving minimalism by using custom OS is just unusable for me and is equal to a dumb phone.