You are way short on reasons why the AR is so much better than the Mini 14.
Lets add the ability to change calibers. The ability to fix your own gun. The ability to get off the shelf parts from a dozen sources and all are affordable. I bet these are not even covered in the video. There are lots more benefits that make the AR a much better gun than the mini 14 by a long shot.
There are any number of reasons why the AR platform may be and is better than the Mini platform. But at the end of the day it comes down to what the buyer is looking for. Not everyone cares about the reasons mentioned about why the AR platform has more advantages than the Mini. Some will buy the Mini simply based on looks, other will buy the AR simply based on cost.
Like said previously the Mini platform wouldn't be as popular these days if it weren't for the gun grabbers. And the A Team plays a small part (at least in the 80's) in the popularity of the Mini platform.
The Mini gets a lot of ribbing, some deserved, some not. On a side note, there are those of us who do remember what Bill Ruger did in the lead up to the 94' crime bill.