The problem is they’ve taken a generally agreed upon thing to an extreme level that makes it unsafe. We don’t let teenagers walk into a Walmart to purchase cough syrup because they can be idiots, you think teens are going to be smart with HRT for some reason?
I think we can agree that anyone should have access to oral antibiotics if they need them, right? Or birth control? But we aren’t putting them in the aisle for someone to buy dozens of them at once, they need to be prescribed so that we can verify that a) they know how to use them but more importantly b) they have a doctor involved in case shit goes wrong. Not to mention keeping an eye on the dose and other safety factors.
Ideally HRT goes great and no one has any issues, in reality you’re putting a something new in your body, you could have an unexpected reaction.
But what if someone decides they want to transition “now” and decide to amp up the dose by a dozen times? Yeah, they could do that with a prescription for a short while but someone is going to notice when an amount meant to last a year is suddenly gone in month.