Roaring is simply not a sound…so “going to a discipline where it doesnt matter” is not really an answer…unless its doing very little work.
My gelding was a roarer when I bought him…he was 10 or 11 then. Perfect for me in every single way, except, he was a roarer. I bought him and had the surgery while I was out on maternity leave. It was not a big deal. No gross incision or drainage. Stall rest for 6 weeks and gradually working up to small amounts of work. He had the added benefit of a longer vacation than required because I had just had a kid myself.
That was 5 years ago. He still eats on the ground (which I think is healthier anyway) but he has never had any problem since. My gelding was a grade 4 and was LOUD, but more than that it is a breathing impairment. Judges consider it an unsoundness, which is why you are dinged for it.
My horse had his left vocal cord removed and his left flap tied back. He can still whinny just fine.
Tie back is not a cosmetic issue, it is a quality of life issue. Think of horses out on a field…if they get to running and acting silly…think of the lung capacity needed for that.
For my guy, I am glad I did it and it greatly improved his quality of life. Would I go through it all again, for the right horse, sure.