I can also don my o2 mask in a about a second too and yet we have regs on that.

From personal experience people often overlook very obvious “fixes” when the stress level gets cranked up(emergency). I’ve had pilots(initial qual and very experienced) fly the sim into the ground with a gear horn blasting in their faces. V1 cuts with a fire bell blaring all the way through half of a QRH. Do you have a headset on with your mask? Will you rip that off too? Will you fumble to put it back on? Will it come out of the mic jack? stranger things have happened.

Like I said there is so much we do “just in case”. I think it’s perfectly reasonable to think this could fall under the same assumption.