I dont think its split opinion as much as over the years, people have learned that chams are a lot less fragile than we give them credit for. Then we have the really old school crowd, and when they first got into the hobby, chams were dying like crazy we were still learning how to care for them, they dropped like flys. So they got this fear of anything and everything. Some over the years, got a little more Lax, and the newer generation took from them, that Chams are not as fragile as we use to think.
Neither party is really wrong, people that are super duper cautious and go to Vet have their reasons to be that way, and the more Lax folks that is their prerogative, they feel they will go the Vet when its needed, and as long as you can recognize the signs when that time has arrived its fine.
We see that divide, on the "Sterile vs Bioactive" debate as well. Alot of the sterile folks, are old school, or learned from the old school. They fear that the slightest bacteria, will cause a cham to pass, as back in the days keeping a Cham alive was very hard, although maybe not because of bacteria.
On the flip side, most Bio folks, see that if you keep it sterile, just like with a human, than the slightest bacteria becomes an issue, where as a strong immune system cham will be able to cope easier, as it has been exposed to Bacteria's before. The "Bubbleboy" Theory in full effect.
We have to remember, they eat Soil in the wild, they eat bark, they live on the plants we deem "Toxic", now captive life is much longer and that may be a factor, there is a good argument on either side, so back to, Neither side is wrong, just different.