Not worth. The smaller OLED screens, while handheld, produce less heat and tend to not burn in as fast. In the rare event that you would experience enough burn in to impede your enjoyment, you’ll either be able to replace the screen relatively cheaply OR or be due for an upgrade.

You can also use ingame versions of that if your game supports it. For example far cry 3 and horizon zero dawn has a setting to remove all static uis after a second or even fully disable them.