Just to throw out a few more at-will attack comparisons.
Commander's strike = takes 1 attack, a bonus action, and a reaction for 1 attack + a die. Enough to use it most rounds of combat. And you can still deal plenty of damage yourself.
Command (flee) = takes a save, and reaction (OA) but also stops 1 enemy action and gives multiple allies an attack. Enough to use each turn at higher levels.
Dissonant whispers = takes a save, and reactions, but also deals damage and gives multiple allies an attack. Enough to be used each turn at higher levels.
So... going by current standards.
At-will attack grant that takes a reaction seem perfectly reasonable at level 5.
At-will attack grant to everyone adjacent seems perfectly reasonable at level 11.
At-will attack grant to everyone seems perfectly reasonable at level 17.