I would agree with this. Boston Lager has tasted the same to me whether in a bottle or on tap, regardless of being a month old or 6 months old. If some are experiencing major flavor shifts you may want to look at the distributor, store selling it, or bar dispensing.
As someone else stated, I don't expect SA to give me a WOW beer, everything I buy of theirs I go in expecting a middle of the road representation of the style, and usually that's what's provided, at a much better price point than some craft beers that are much worse sometimes. They haven't shown that they're going to be the most innovative in any style, that's fine by me, and as well as they're doing must be ok for many others as well.
That said, I prefer to go to a local brewery that's churns out a new IPA, NEIPA, stout, or something else almost every month or two. I like trying the new stuff, am more of a seasonal drinker that going to a regular "standby."
I don't think many would say that everything SA brews is bad, they just don't push the envelope, relatively speaking, only starting making IPA's in the last few years, and don't mass distribute hardly any of their "small batch" or big beers.