They actually have a lower rate of patient regret than LASIK.
This is a study:
https://link.springer.com/article/10.1007/s10508-014-0300-8
n = 767. Over fifty years. Lower rate of patient regret than LASIK.
Further, sex reassignment surgeries aren't the only treatment, and they aren't even one relevant to the article.
"The regret rate is defined as the number of sex reassigned individuals at the time period when they did their first application that will later apply for reversal to the original sex"
The study also did not account for suicides or being sanctioned in their regret rate.
Unfortunately, therapy alone generally isn't shown to make suicide rates or gender dysphoria go away.
Elsewhere in this thread I posted a link to a great talk that has the leading expert in transgender care go into extreme depth on methods of treatments for transgender patients. If you want a doctor's perspective, and one that has probably the most experience tied to it (he sees an incredible volume of transgender patients), I definitely recommend checking it out.