Why the hate for 1,2 Switch? It's nice to see diversity in the Switch line up, plus it's a great party game.
No it's not, Jackbox is a great party game, Buzz is a great party game, Singstar is a great party game, Just Dance is a great party game, Mario Party (most of them) are great party games, Wii Sports is a great party game, even Wii Play is ok.
1-2-Switch is barely a game. It was created for one reason "what can we do with these new controllers." Fun took a backseat, as did anything remotely related to rewarding skill.
Most of the games you mentioned are just good local multiplayer games. Street Fighter was a good party game too when it first released. 1,2 Switch has more in common with Twister or Pass the Parcel than any of those.
The 'tech demo' comments aren't justified. Only one game uses the IR camera and maybe 2 or 3 actually use the HD rumble. The rest could be done on the Wii.
I can't think of another game that is local-mulitplayer only. No CPU opponents, no online multi and It doesn't even keep track of players names/high scores. It's more 'pick up n play' than Wii Sports.
edit: I suspect Nintendo was going to bundle 12S with the red/blue joycons before they thought better of it.