The main reason Switch 2 (and most PC handhelds) don't have OLED screens is because the manufacturers (including Nintendo) have prioritized free-sync/g-sync. OLED displays that support free-sync are too expensive.
Although, Nintendo sort of botched that so far with how poor the implementation of G-Sync is on launch.
Nintendo could've gone with an OLED for probably a slightly higher price (or lower profit), but then it wouldn't have G-Sync support.
I think they made the right decision, to be honest. More people are sensitive to screen-tearing than slightly degraded motion clarity, and OLED level colors, brightness, and contrast ratios are more of a nice-to-have than a necessity.







