Those issues are not general, not everyone has them so that depends on user and phone.
The Moto x has a lot of mics so he can listen to you despite the position and place.
And like i said the camerajb app is better than stock.
Sent from my GT-I9300 using Tapatalk
So if im recording video an my hand is holding the X normally like at the bottom but covering the rear bottom mic,the sound will still pic up from the other mics or will it be muffled?