Bingowings said:

The briefing really should be more... brief.

Cut the medical droids, cut the gossip about recent promotions (and yeah Wedge would make more sense as the leader of the attack).

Look how naturalistic the briefing in ANH looks and compare it to the 'at all point's fake' briefing in ROTJ.

Technically, the gossip is before the briefing so it doesnt change the length of the briefing.

Also the reason the briefing in ANH looks naturalistic is because:

1. ANH was made in '77

and

2. It was on Yavin IV, not a Mon Calamari ship.