I'd say make Step of the Wind better in a more unique way. Give them a flying speed equal to their walking speed until the start of their next turn on top of everything else. That way, monks have an option to challenge flying enemies as well. It would be expensive to keep it up but it would give them much more important mobility in combat.A fair point, except that I always see step of the wind as the most situational of the abilities.
Sure, disadvantage and +3 AC is AMAZING and likely to make a single opportunity attack miss. Step of the Wind with a Dash though allows the monk to guarantee that a dozen opportunity attacks don't even get made.
Is it generally weaker? Sure. But, Step of the Wind has always been the weakest option, because it is mostly for dashing and monks are crazy fast.