Dairy is tricky to discuss because the fat, protein, and sugar fractions all seem to behave like different foods.
The fat seems pretty benign and low in omega-6. Butter is lovely. Cheese can have interesting micronutrients like K2--the more raw/pastured/aged the better. Cream is okay if you don't drink it by the gallon.
Protein (Greek yogurt, skyr, ymer, cottage cheese, qvark, paneer) is convenient for light meals. I don't use powders or isolates.
Sugar (lactose) seems to be the least useful part. Tall glasses of pasteurized milk are probably best avoided.
Lots of: urban hiking, cycling, sprinting
Lots of: fresh meat, seafood, eggs, organs, tubers, starch fruits, vegetables, meat fat, dairy fat, oil fruits
Some: cured meat, dairy protein, sweet fruits, rice, pulses, tree nuts, oil seeds
Minimal: soy, refined proteins, sugar, liquid carbohydrate, grains, refined oils, peanuts