They have a new way of handling this where "a new squad is created when a friend joins your game." This is on by default but can be switched off. The old method wasn't "on par".
Sorry but your pre-match drinks with the boys in the lobby won't be coming back as the studio has no plans to revive it. They prefer to wristband you instead once you're in.
"We have a new feature in Battlefield where a new squad is created when a friend joins your game. You can toggle this option on or off by going into the options menu. We’re not offering the old squad join feature because we didn’t feel that the feature in Battlefield 3 was on par with the quality that we wanted to offer our players," DICE posted on .
"We have no plans to add it in the future.” Comments from fans followed saying that this apparent feature in Battlefield 4 wasn't working, or at least not fully. DICE has just for the troubled launch of the shooter which has had numerous server woes and some severe graphical problems on PC.