It’s the usual JJ problem; rush through it all and don’t think about anything. It’s about emotions it’s not about story. What matters is what you feel when the old and new (R2 and BB8) fit together with two map pieces.
JJ is a lot like Lucas, and most of us, in many respects; some strengths and some weaknesses. He probably listens to others more than Lucas did - but they aren’t in the same league talent wise as those who Lucas had with him when making the OT.