I understand the cautions you present. I think that is one of the things that has caused hesitation in the upper eschelons in the past. I also believe that over time, they have seen that the benefits outweigh the drawbacks. It is important to remember a few things, no matter what level you are at:
1) when I train in another style, I do my best to do what they do...and accept that I won't be 'up to par' for the technique as I do it. I'm there to learn, not to show off my technique.
2) I work on what I learn when it is appropriate. after class, before class, on my own, with a few other people. Not during my instructor's teaching of our technique.
3) be mature