Destin at Smarter Every Day shows you the effects of hypoxia and why you should put your mask on first before helping a child or other passenger.
It's the first time I recall seeing times printed and it really illustrates how quickly it'll hit the fan. 10 seconds isn't alot of time but the order is still critical.
I wonder if that clarity on timing would frame it better for other people instead of an open ended 'me before them' blanket rule.