I disagree. I have access to several different brands of oat milk, and some of them are sweet, some are not. The neutral ones declare less sugar than Oatly and they don't use any noteworthy amount of salt to balance things out. The brand I prefer declares sugar content at 3 grams per 100, which is a bit less than the nominal amount of lactose in cow milk. I of course understand that these two sugars' GI profiles are different, I'm just pointing out that there is such a thing as neutral non-viscous oat milk.