There's some cap relief in moving-on from Atwell (just under $1.5M) but it doesn't seem to make sense to me.
Good or Bad, Atwell is the Rams' #3 WR right now, and the Rams play mostly three wide receivers. Furthermore, the two guys in front of him (Kupp and Nacua) are terrific but they take a lot of hits, and neither may prove to be very durable. After that, the Rams don't have much at the position.
Now if the Rams add a couple guys ... say they re-sign Robinson or a free agent (Darnell Mooney anyone?); and draft a WR in the 1st through 3rd rounds ... I could see them moving-on from Atwell, as I don't see him getting an new contract for 2025. Otherwise, I think he remains on the Team in 2024.
Now, if Atwell plays like Van Jefferson did last year, and becomes a complete Non-Factor ... then Yes, move-on.