I completely and fully agree to this.
Let's say it's a tournement and you are a Steel User, and the rules are no CJ's. But you have like a pack of Steel CJ's that you made, and then you can't use them in fights like these so that's basically taking away the purpose of the bio has only 1 technique to be used. I mean right now, I see a unbalance in bios ,so many people have Ice Bios because they have a whole batch of techniques. You rarely see anyone with a steel bio, now do you? I say the mods make 5-7 techniques for each element that has only 1 technique to increase the diversity in bios, because we all would get tired of fighting the same Ice Users.
P.S, Sorry about grammar errors.