I thought required SOP for using the evacuation slides was "Shoes OFF".
Perhaps if you were wearing high heels. Our seat pocket safety cards used to specify leaving shoes on for takeoff and landing, so I took this to mean that you'd need to keep them on during an evac.
At what point would
you take off your shoes? Personally, I'd prefer running over burning pieces of twisted metal and plastic in sturdy, enclosed shoes, thanks (and I remember a time when check-in staff would ask pax to put on sensible shoes if they turned up at the desk in less-than-suitable footwear).