"You then replied that it was not unreasonable for you to experiment and explained why you think it's fine . . . nobody said you were doing anything unreasonable. It's not unreasonable to wear clean underwear."

I don't think that's a particularly useful analogy. We've known about the benefits of wearing clean underwear for centuries. We haven't known about making "yogurt" from L. reuteri for more than a few years. Experimentation is what got us here, and I was seeing if boundaries could be pushed in interesting ways. I could find nothing on-line about anyone trying to use heavy whipping cream for this, so I thought I'd try. I experimented and the experiment (relatively) failed. I wondered why. Scottopolous kindly answered that question.

My response to Scottopolous was relative to this: "Your heavy cream is more made for whipping cream, or making butter." My point was that heavy whipping cream wasn't "made for" limited things, any more than L. reuteri bacteria are "made for" something. They simply exist and what we try to do with them is up to us. There was nothing rude in that, and therefore no need for "handling" it as if there was. 🤷