No dude. FQA is mandatory, but it is not a deep dive into the performance of your game. It is a very cursory look at how certain basic functionalities are implemented that impact specific elements of the average user's experience (and in the case of VR, their comfort) and ensuring that certain basic branding guidelines are adhered to. It is a short process that takes place over a couple of days, that follows a specific checklist of major use cases.
It is also completely free, unless you submit multiple times in excess of what is acceptable, which is an exceptional and rare situation.
It's not their job to make sure your online component works, or that your game doesn't hard crash 30 hours in. It's not intended to be a subsition for good internal QA, and they make that expressedly clear.
From what I know of the QA folks, they are very patient, they take their work seriously, and in my experience with them over the last couple of years, have been pretty cool. :)