The principle medical reason for gender affirming care is that it SAVES LIVES. We have statistics on how often and severely people experience regret and we know it is not a significant factor. You’re talking about outliers. Not everyone has access to counseling. We can deal with X number of people with regrets if it means X*Y (for some reasonable Y) people don’t actually die.

Presumably you believe that anyone with a uterus should be permitted to have a child without first receiving counseling on how it is going to potentially destroy their body from the hormone exposure alone. What is the meaningful difference?