Would recharging your A/C make the vent temperature cooler?

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I've been reading online and I am very confused. Some say you should never recharge your A/C system if everything is operating properly. While others say adding pure 134a refrigerant/coolant will help with your cooling. My Mazda dealer says one shouldn't need to recharge the A/C either.

In particular, my 2005 Mazda3's A/C isn't quite as cool as it used to be. Additionally, in 2006 my A/C was checked at the dealer, discharged and new coolant with a dye was added under warranty for another issue. My understanding is that with the dye or lubricants, the A/C won't run as cool as one with pure coolant.

In Asia, where temperature extremes are normal, people get their A/C unit serviced and flushed too at the dealer.

Below are a few youtube videos that claim to improve your A/C performance:

https://www.youtube.com/watch?v=ey7Vhm9ZI_U

https://www.youtube.com/watch?v=xLjgSOOX4Lo
 
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I recharged my AC on my 2014 CX-5 maybe a month ago. Cools much better now.
 
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