The pitch doesn’t deteriorate at all after 4 days visually and also there is no change in the gameplay of ball physics. The ball bounce and spin on Day1 and day 5 of a test match is same always.
Im not sure if this is a feature or a bug but the ball variable bounce based on oldness of the pitch should be there.
This brings in the reality of a test match in the game.
I have raised this as a ticket anyway.