It's not that the techniques change significantly (except for speed and force, maybe), but in practice it can lead to unacceptable risks.
If the shodothugs can do it, everybody can.
BTW, what are "unnaceptable risks" for you?, for instance, in the clips you can see in this worth reading article
written by forum member D. Valadez show a (for me) safe training environment even if there is spontaneity and opposition.
Do your think Valadez and his deshi are taking unnaceptable risks?