"Most" includes standard issue corporate hardware for office drones, bottom of the barrel laptops bought as gifts to children, and ultra cheap Android phones in developing countries.
absolutely not, try finding a 15" 4K OLED with a refresh rate other than 60Hz
there are plentiful OLEDs in 4k with refresh rates from 100Hz to 480Hz. your problem is a small size problem. 15” is targeted more towards portable work monitors, not gaming in 2026
that 4K monitor has touch and pen support too. and it was $300. you'd be hard-pressed to find such a thing for $3,000 and even then you wouldn't have high refresh rate