My wife has a late-in-life diagnosed cow's milk allergy. I've been experimenting with alternatives for 18 years.

There are often a small handful of substitutes that work for specific dishes. A vegan place near me makes absolutely banging DF mac and Cheese, Daiya flavored cheesecakes are 70% of what a real cheesecake is. None of the substitutes are catch all, most aren't even catch-multi.

Country Crock (or many other brands) DF whipping cream is the closest sub I can find for things, but you have to be careful, it has a subtle sweetness in it that messes with things you don't want sweet.