If this device will be sitting on your home network constantly, I'd be considering another device from a trustworthy brand that gets updates.
If it shows the same thing constantly, I wouldn't want OLED.
An iPad (basic) 8th gen or newer is still supported by the next OS release and likely will last longer than a generic device.
It would likely be worth buying a tablet from a large brand with good battery controls & settings like battery life longevity management. I'd recommend using a smart outlet to cycle the tablet on and off of battery regularly in addition to using the 80% battery rules.
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