I don't understand it being the only way to play just because it's objectively the best way to play. Second player is forced to use a "lesser" control scheme, so what's wrong with first player using it because they actually want to.
Nothing wrong with options. If someone wants the option to be "worse off" than everyone else in multiplayer then that's their choice.
The map would actually be easier to use if you had it in front of you or next to you. Having it on a stand and just tapping a teammates name to jump to them should work just fine.
I'll personally be using gyro myself though, feel good man.