Basic Shimano BR M446 brakes. Centerlock rotor.

If I grab the brake while not moving, I can rock forward and back a bit.

Everything seems tight. I double checked. The frame isn’t cracked. The rotor body isn’t cracked. I cant feel play in any individual component.

Yet, here we are.

My other bikes and the front of this one don’t do that.

I think it’s just inherent flex, 29” wheels, post mount adapters, mid range components. Should I investigate further or is this ok?