I mostly agree with this. I think the Sox are pretty well set too. That said, acquiring the right player can affect performance in a positive way.
Acquiring or not acquiring players at the deadline can also send one of two opposing messages to the team, either the FO thinks the team is good enough as is, or the FO doesn't think the team is good enough to warrant spending resources to make improvements. With the Sox being in 1st place, I would think the former would be the message that is sent, but getting the team to buy into this is key. Cora is very good at that type of thing.