In my experience communications across a socket does not force a separation of concerns. It doesn't even encourage it.
Heck, because asynchronous communication in a non-deterministic environment is so hard to deal with, my experience is that such communications encourage shortcuts to be taken, so yes, I think it encourages tight coupling.
The only thing that somewhat encourages a separation is having different people responsible for different modules and because people are selfish, they'll fight for their components to have less responsibilities, not more. So it becomes a territorial thing. But this happens only if you have seniors that know what they are doing, otherwise rookies or less competent folks end up cooperating to "get things done".
Heck, because asynchronous communication in a non-deterministic environment is so hard to deal with, my experience is that such communications encourage shortcuts to be taken, so yes, I think it encourages tight coupling.
The only thing that somewhat encourages a separation is having different people responsible for different modules and because people are selfish, they'll fight for their components to have less responsibilities, not more. So it becomes a territorial thing. But this happens only if you have seniors that know what they are doing, otherwise rookies or less competent folks end up cooperating to "get things done".