It's very important to hear the stories of detransitioners - by understanding what went wrong for them that we can refine treatment protocols and get treatment to trans kids even sooner.
It is at least good to know how rare detransition is.
Unfortunately, a lot of detransitioners detransition, not because they aren't trans, but because they can't live with the relentless transphobia of the society they live in. Again, we need to hear their stories and tackle transphobia head on.