One last mod to talk about—and this one is neat: the endcap for the hub, designed to keep your hub from moving much relative to your brake mount. This often doesn't get much attention. If the brake mount area of your frame is super flexy, your rotor will push into your caliper, causing it to drag on the pads. In extreme cases, it can even reset your brake positions during hard cornering—especially if you're dropping into a corner so hard it feels like you're landing sideways… or if you're actually landing sideways. This is known as brake pad knockback.
I personally suspect this is one of the causes of Shimano's wandering bite point: a stiff rotor combined with mineral oil-lubricated pistons (slippery), plus a compliant frame loaded in a corner, can slightly reset one side of your brake caliper. This requires you to pump the brake to get it back to normal. That said, this doesn't happen with all brake setups, but it's worth considering in frame design. Some brakes might get a bad rap because of a flaw in the frame. Like how shocks sometimes blow up, and people blame the shock company, when in reality, the frame wasn't even close to aligned throughout the suspension travel.