Yes Cherimoya, that is the point that I was making. Yet, you do NOT HAVE TO heat the cheese to make hard cheeses. I buy cheese from a grass-fed raw dairy farmer who makes the cheeses without heating them at all. It's rare to find though.
Quark and cottage cheese are particularly easy to make without heat of course.... but those are even harder to buy because in most states the law is that cheeses need to be aged for certain number of months for each particular cheese in order to be sold raw. You can get raw cheddar but not feta for instance. One would have to go to the actual farm to get the soft cheeses, just like you have to go to the farm to buy raw milk in most states.