Welcome to the world

You are not entitled to have everything you want.
It is the developer's game, it's down to them and their publisher what they do with the iP.
You do not own the franchise.
You do not have a say about what they do with their franchise.
If you don't like it, don't buy it.
There's a miniscule advantage involved "Z0mg, new ammo I CANT GET BCUZ I DONT WNA SPEND ANOTHER £5!?!?!?!?!??!?!" is a poor argument for there being an unfair advantage.
Paying for the new content now supports developers in the future, EA aren't the bad guys anymore, they're surprisingly good with developers.

My view on the whole thing tbh.