The way fans rushed towards a goalscorer, the new chants and the more diverse range of atmospheres depending on where you played your matches all helped FIFA 18. This is something EA should look to expand upon next year, because the look and feel of each match could be even bigger.
Imagine pre-match shots of fans hurrying to their seats, placing an order at burger bars just outside the ground or vendors selling scarves on the streets. These flyover scenes wouldn't be hard to create, and they'd add so much to the immersion level of club football in FIFA. Not every supporter is in their seat moments before kick off, so it's something to think about.
It'd be hard to implement, but it'd also be cool to see fans actually leave early if the home team was having a stinker. It's unrealistic for the folks inside Loftus Road (for example) to stick around if QPR are being hammered 5-0 at half time by a Championship rival.