Guessing you meant to ask "any starting point for steamdeck running emulation now" or something like that.
If so, I'd recommend EmuDeck [1]. It took me about 10 minutes to set up and has emulators for essentially every platform you could want. (Just need to have roms.) Also, it's open source [2].
Is it true that 3DS hardware supports Genesis games (as seen in the screenshot)? I'd love to know the story there. Was Sega involved? How does it works in hardware, since the Genesis has 68k/Z80 CPUs, and the DS family uses ARMs?
I've got a GBA with a backlight mod and a flash cart. Flash carts are a game changer (pun intended) if you've got original hardware. I love systems like the Anberic but if you've got original hardware flash carts are the way to go.
For me at least, I think the Steam Deck has it beat these days, although I'll admit I miss the smaller form factor sometimes.