Because the process will ensure that it does.
This isn't like an arm wrestling contest, over in moments, the strongest the winner. This is akin to war, where a sequence of long and costly battles are fought, leading eventually, over time, to a victor.
Looks to me as if the PL don't have a smoking gun to win this quickly, so they've piled the accusations high in the hope that a few might stick. Everything about this tells me there's been a complete breakdown in the relationship between City and the PL. Be under no illusion, there's real hate in all this, as there should be, there's hundreds and hundreds of millions in revenue at stake here.
If ever there was a case for an independent football regulator to bang heads it's this, it's no coincidence this case was brought before we have one.