There should be some sort of “waiting for players to be ready” system before a match starts. More than a few times the enemy team has loaded and spawned faster than my own giving them a head start. I have also received this little head start. Giving either side a 10-20 second head start can really decide the first objective. Whether it is going to be exponentially harder to take because the defenders have had time to set up or whether the first objective is already armed/repaired before the defenders even got there. This is especially annoying on stopwatch matches when in the first round one team has a clear head start and in the next both spawn at the same time because they no longer need to wait to load into the game.
