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I think the fundamental issue with Android that can’t be fixed is complete power down and full boot time.
With a custom Linux, instead of sleep where there is minor battery drain, the handheld can turn itself off completely for no battery drain. Cold boot time is like 10 seconds. It means the hand held has a battery charge whenever you want to play it and you don’t have to wait.
OnionOS changed my entire mindset about what a retro handheld should be. I have an Anbernic 351m, Retroid 3+, and now a mini.
The mini, despite being technically inferior is by far my favorite because of OnionOS. Being able to turn it on, have it start right where I left off, and then ignore it and it completely turns itself off- not sleep makes it so easy that I play it all the time.
Retroid means Android which means it sleeps instead of powering off. And fill power on is slow. And configuring a Game Front End is always extremely time consuming.
Onion just works. If they added a single Thumbstick to the Miyoo, it could handle N64 and I wouldn’t need anything else.