Rangerrich99,
This really is not about the OP's question of
BUT...
I will say that even though your 2 videos are from 2012, the first one is correct in a few points.
1) You want the Red Dot actually milled into your slide (not Dove Tailed in and a mounting plate sitting on top of the slide)
2) You want to have your Red Dot with Co-Witnessing Iron Sights.
3) With anything new you will have to train with your Red Dots..
However if you have good technique of raising your gun and lining it up with the Iron Sights, your Red Dot will be there.
And as everyone in almost ALL Red Dot videos say, "It get's really good fairly fast.
You can train with the gun empty and in the comfort of your home.
You had to learn to use the Iron Sights..Now train with the Red Dot.
In the 2nd video
1)Talking about the Red Dot going out.
Most of today's Red Dots have completely different electronics, built much more robust to take the jarring slide movement shot after shot.
2) Improved battery life & placement.
Red Dots on Pistols The Good & The Bad
https://www.youtube.com/watch?v=SNH262vjKK4
Red Dot Sights on Carry Guns a Bad Idea?
https://www.youtube.com/watch?v=gD95JL6Zhp8
Red Dots are not for everyone, myself I really like it on my Carry P320.
There are many good points in regard to using a Red Dot.
The worst negative is that it won't be on.
In 2500 rounds with my P320 Romeo 1 it has yet to not be there for me.
A nice feature of Sig's Romeo 1 is that once the gun sit's motionless for 90 seconds, the Red Dot turns off to save battery life.
Pick up the P320 and the Red Dot is instant on.
Lastly youtube is loaded with videos concerning Red Dots so there is not a possibility of you being mis-informed or unaware.
Mackie244 / Bud