What bollocks this is.
It was obvious it would become permanent, predictably in the likes of Serie A before the Premier League.
It's a rule change to please tinkering managers under the predictably successful guise of 'protecting the welfare' of players - which incidentally it has emphatically failed to do as far as I can see, because I'm noticing more injuries than ever before, across all the leagues.
You should never be able to end a game with half a different team. It's farcical.
Just another small piece of football's deterioration.