Do riflescopes shift point-of-impact and for what reasons? They are notorious for doing so, but how much matters? That depends on what you are trying to do with it, i.e. what level of accuracy and precision you require. If it is great enough, it can affect any shooting endeavor.
I have been competing in several shooting genres my entire adult life. None are so demanding of precision than 100-, 200- and 300-yard Benchrest. If, on a good day, you are not shooting 25-round aggregates in the teens, you are not competitive. If your scope shifts point-of-impact for any reason, you will end up in the bottom half or worse at the end of the match. The scopes used for many years were the 36X fixed-power variety made particularly for Benchrest. Shooters began to suspect that point-of-impact (POI) shift might be the reason they were not doing as well as they thought or hoped they should be.
Things I would have changed: I wish more companies would drop the illuminated cross hairs and instead use a side focus. Also as many scopes Center point sells, dovetails rings would be nice instead of the weaver rings that I have piling up.