Most mobile game developers just want to attract whales. People who spend thousands of dollars in their app. They don’t care about everyone else because they don’t make any money off anyone else.
The console doesn’t officially support ROMs. It must run games off the original hardware carts.
However, there’s a fairly simple hack to get ROMs to play on the SD card slot of the Analogue Pocket that many suspect was unofficially developed by Analogue themselves.