i think a lot of you don't have experience with watching football.
acting hurt has been a fixture since forever, they even train them for it to make it look convincing.
personally i don't like it, but you're supposed to attract the attention of the ref.
you noticed that it didn't change since high def replays are a thing? because nobody gives a shit, including the players. if it works, you might give your team a win. if it doesn't, at most you make fun of it online.
i swear, it's only insecure americans i've ever heard complaining about this.
nobody in the rest of the world gives a shit.