I have a question. Why would I want to change the recoil springs on my Glock 20 SF? I have read many froum posts where people have changed the springs in their Glocks. Not only changed the spring, but went away from the Glock 15(?) pound spring and either went up or down. I want to know why. What is the benefit. I would assume that it absorbs recoil hence the name of the spring) but would putting a heavier spring 22# reduce recoil. No Iam not afraid of the recoil or trying to tame it down, just curios and trying to learn before I place and order. A friend of mine had a Glock 35 one time. He bought it new and 300 rounds into it, the factory Glock guider rod broke. So he got a tungsten guide rod. Now that I finally have a Glock I am going to keep, I am going to add a tungsten guide rod. Some come with the heavier spring or the factory standard or even lighter springs.
You don't have to change a thing. Most of us 10mm guy's are tinkerers by nature and are looking for that optimal performance between the gun and a certain load which means lessening recoil/muzzle flip with hotter loads (to get that faster 2nd shot on target) and some of us just get tired of walking 20 feet or so looking for our brass. My old G-20 is stock except for the sights, never had an issue except ruined brass. I did add a non captured, steel guide rod to my G-29 and went up a little in weight to add a little more control with the hot loads I carry in her. But, like I said, you ain't gotta change a thing, shoot it and enjoy it. I bet you'll start changing things on it though.
Lighter springs would be for very light target loads. Heavier springs for very heavy loads.
However, to your point...don't change your springs unless/until you actually are seeing a problem like failures to cycle with light ammo, or severe glock smiles with heavy ammo. 90% of the guys that are switching up springs are not shooting ammo that is far enough from spec to warrant the change.
Just like most people with 4X4's, at worst, drive on gravel roads occasionally.