Operationally it’s a disaster not only because of the safety concerns due to the loss of reliability in the radar and/or comms, but also because even when all equipment is working properly, the coordination between the EWR area and the LGA controllers is less direct or effective. This is also true between the EWR area and the Liberty area.
When you work in the same facility, even if on different areas, you get to meet everyone, and share time together not only on the scopes, but more importantly off the scopes, whether in the cafeteria, the break rooms, or hanging out together at a local bar after a tough shift. You create personal relationships with the other guys, you know everyone's names and voices. When you get a call on a landline to coordinate something and it's your buddy on the other side, you go the extra mile to be helpful and accommodate whatever request. We're all on the same ship kinda thing. This opportunity for creating personal friendship bonds is now broken, and as new controllers get hired and old ones retire, the new generation will have zero connection to each other at both ends. Trust me, its a lot easier to shut the door down on somebody you don't know on the other side! This move has made the operation less efficient even when everything is working properly.