True and not true
Did you get vaccinated for smallpox as a child? This was anticipatory maintenance. Maybe necessary and maybe not. Horses do not always need something but, due to stress and changing conditions such as age and level of work, they do like any other athlete. While the ulcer treatments can be a bit extreme, and I agree with you I would not use one if I didn't need it, I could see a good preventative probiotic.
I have done this for 35 years at the top levels of the sport and for the most part you can get by with very little but it is that little part that can mean allot! The high starch diets of the past cause a ton of problems with Ulcers. Out farm switched to a high fat diet 9 months ago and have eliminated the problems with a new tech probiotic that we were on farm trial with.
It all depends on the horse and the condition. I think if you have your horse on constant Omerperazole then you have a holistic issue. Feeding, genetics, environment, training, etc.
In a ulcer study I read, it said that 85-90 of the 2-3 year olds at the tracks were starting to have ulsters. If you know that do you not try to prevent it?