As I said before getting shoes off main benefits on a water ditching ,are keeping the door(s) unlocked preventing jamming and letting water in case inverted as water pressure prevents it to open . Extra benefit in case unconscious : it helps other people to get you out without having to figure out how to unlock the door or slide the canopy .
those 3,benefits alone ( besides faster swimming ) far outweighs anything else .such as eventual minor injuries on foots on metal bits …
But seat belts releases is the one to watch for and train as they are the killer ones . As Pilot DAR said some do not open easily or even not at all under pressure .if you fly in one of those aircraft then carrying a seat belt cutter ( 10 eur or $) in any car accessory shop would be my advice .