There are plenty of supposed Steam Deck killers available in the portable gaming space, from the Asus ROG Ally to the Lenovo Legion Go and all the Ayaneo and ONEXPLAYER devices in between. But none of them have managed to outright slay the dragon that is the mighty Steam Deck yet.
Eh I don’t think being verified means all that much because in my experience there are games that are verified that just don’t play well on a deck because the game doesn’t lend itself well to deck controls and there are others where the control factors keeping them from being verified are trivial but not addressable given valves strict definitions of ‘verified’. Example: Noita sucks on the deck and it’s verified. It’s like 10x more difficult to aim on the deck relative to a M+K setup and makes it feel clumsy as hell. Meanwhile, Against the Storm, Soulstone Survivors, Dwarf Fortress, and Civilization all have great experiences on the deck and I’ve happily played multiple hours of each chilling on my couch without a thought about the controls and none are verified.