I thought this was a feature confirmed by Crytek to be in the game.

Yet, it isn't.

It is.

But bugged.

I was shocked to see that sprinting no longer takes energy

I thought this was a feature confirmed by Crytek to be in the game.

Yet, it isn't.

Dear monkey. Please, refrain from using past participle ("confirmed"). These fairly difficult constructions suggest that you might be a human being but judging from a biological point of view this is completely wrong.