Appreciate your taking the time to respond. Unfortunately, while I know all this, it doesn’t quite line up with my experience. I’ve seen the difference between an aged cheese like 3-year cheddar and American. But, there’s still a reaction to the cheddar, even if slight. (And, yes, I’ve had the allergy tests…)
So, I’ve found it safest to go with vegan cheese, particularly when the cheese I really want is American (or, at least Gruyère). Unfortunately, I never could get into breakfast sandwiches or burgers with cheddar—the stuff just breaks too easily.