I've been playing games all my life on many different platforms, but some of the best fun I've ever had has been on handhelds. Even when I also have the PC or console version, some games just feel more at home on a handheld, and more appealing when you don't have to commit to a whole session of playing them. On one hand, handhelds take less focus than sitting in one place staring in one direction, so you can play on…
There are a whole bunch of those OGA-derived handhelds (see https://obscurehandhelds.com/ ). I have an RGB10 on its way to me right now. Unfortunately, the library of native titles is very, very small, basically just Tux Kart and whatever open source engine recreations have been packaged for the particular distro you're running on it. So it's mostly about emulation, which means that what you're seeing is a pretty far…
The problem as you say is the lack of native titles, and an uncertainty about how long the devices will be supported for. In this day and age an official distribution channel like the App Store/eShop is important too, even if it's just a website you can download from onto an SD card.
But I'll try one of these out!