The shoes
If you jump down the slide wearing pointy or any other shoes , there is a STRONG possibilty that said shoes will snag on the slide and you will tumble to the bottom.
You will suffer greater injuries than scraped feet when everyone else exiting the airplane lands on top of you in your bundled heap at the base of the slide.
The slide is rubber (or similar) with a talc coating, but shoes are brakes and they work swell.
You DO NOT want brakes when exiting an aircraft.
Thanks Volume for the safety card.
Somebody didn't just "think up" the "shoes off down the slide concept". It was proven in practice.
PB