That's the other appeal about soccer. While it seems that you just let 11 guys out on the field to do their thing. The coach puts a huge strategic imprint by how he uses substitution.
In this case poorly because he used up all subs trying to generate a goal. But even more important why weren't Vardy, Rashford, Kane, and Sterling all out on the field from the get go? I would have adapted the team's structure to make it happen.
If the game has to be stopped because you are on the ground rolling around, you should have to be removed. If it is determined even after that you flopped, you should be out a game. With all the flopping and fake injuries, the game is unwatchable.