No, FDA is not that simple. FDA review will look at numerous things and raise many questions. Ones I can imagine are related to: dropouts, titration, no dose response (if 30mg shows no benefit) and this a small trial (160 in treatment), etc. FDA will have many more questions that we can’t even think of.
You should read a public briefing docs — which is typically 100-300 pages long, and you’ll see the extreme extent to which FDA analyzes/scrutinizes.
I have been very very impressed by FDA for that reason. They deserve all the praise (even though they are NOT flawlessly competent).