AC System Recharge Info and Opinion?

I've been reading up on this a lot recently since my ac isn't as cold as it once was. I've watched a lot of youtube videos, read a lot of threads, and read a bunch of consumer reviews. There is nothing majorly wrong with my ac system (to my knowledge). It blows cold, but its about 15deg warmer than it should be. Compressor runs and doesn't make any bad noises.

A lot of people recommend an ac recharge, ACPro or the likes. It seems that these work because they have a sealant in them. Well, not necessarily a sealant, it is more of a conditioner. A sealant would clog the orifices and throttling valve, this is a common misconception about these AC recharges. The conditioner, conditions all of the seals and O-rings making them swell back up and "sealing" any of the very small leaks that are present. So it seems that people do this once and if it fixes their AC for a month + it is deemed okay. If the refrigerant leaks out before then it is indicative of a more serious problem or leak (according to ACPro) and you should not recharge it again. This seems to be the root of most people saying "it will destroy your AC system." It seems that it won't necessarily destroy it from one use, but rather it is the repeated recharges that introduce too much conditioner and additives into the system, making other things fail and causing more problems.

Does anybody else have any other well-informed input on this? I understand that AC systems are rather complex but I have studied them in college in a couple courses and have a pretty good understanding of how they work.

References (these are a couple of the sources I found most helpful/interesting):
http://acprocold.com/blog/car-tipstricks/shouldnt-use-ac-pro/

https://www.youtube.com/watch?v=SHg2xRMnM38&t=2s

https://www.youtube.com/watch?v=Pdq8JAlct6s

 

the direction to take is dependent on the size of the leak. If it takes years for the system to loose enough freon for you to notice I would think that the single line ACPro quick shot would be sufficient. I would watch the sight glass for a few minutes to see the flow and pattern of bubbles in the stream as the compressor cycles and when you are comfortable, squeeze the trigger a little and watch the sight glass. The bubble stream should be greatly reduced. Don't go overboard as an over charge is not good.

look for signs of dirt at the various fittings and connectors. When the freon leaks it usually takes some of the lubrication oil with it and the oil holds dirt. If you are missing the fill caps, get some. They help greatly with the minute leaks past the schrader valves. If you are going to empty the system, replace the schrader valves, vacuum pump it down and recharge. The most common leak points are the compressor shaft seal, damaged condensor and a rotten evaporator.