You must be new to the world. It was not an assumption, it is stating a fact. A striking majority of Mavic owners have zero issues with the 700 firmware. Otherwise the forums and blogs would be blowing up about it. Most people have no need to search out and join a specialized forum just to say "Hey, my quad is awesome. Thanks for doing a good job making it!"
Those that do are the ones with issues. So yeah, how many Mavics have been sold by DJI? And then how many complaints about this specific firmware exist? Then you minus out the people who cry about it because their favorite youtuber said so and yet have never tried it. You're left with an admittedly small number compared to the number of Mavics flying daily without problems.
Those that have complained that are running it; I've read most of those threads both here and on RCG.. I found greater than a plurality of complainers who actually tried it, could be led back to either a bad flash, poor environmental conditions, or bad supporting hardware....all which are out of DJIs control. I weighed the decision carefully before upgrading my Mavic. I freely said I had my own problems too, but it was directly related to a bad flash, which I did not fly on, and was resolved by flashing again.
What would it matter if I was employed by DJI? Obviously I wouldn't admit my own issues, and my posts would be decidedly different painting a rose colored glasses picture everywhere. FWIW, I'm a manager for FedEx Ground, and have zero to do with DJI beyond flying a Naza2 in my T650, this Mavic on my table, and stumbling across the occasional box from China being shipped to some stupid college student's apartment.
I'm a student of probability. I love playing the odds and pushing the envelope. In this case...the whole firmware argument...the odds are much greater than your phone sucks (out of space, under spec, other incompatible application), or you flashed the upgrade incorrectly, than DJI pushing out a dud buggy firmware without an immediate follow up. This isnt the olden days of the Naza where the low quality code was a definite problem. Again, the numbers speak for themselves. As does the relatively small numbers of actual issues obviously not related to user error versus the numbers of upgraded birds flying daily.
So by all means, keep drinking the kool aid. I'm sure nobody notices your purple mustache....