Explain why that is bad?
Some situations in aid climbing.
My understanding of the purpose of the clean nose is to prevent accidental opening when rubbing across a rock. Makes sense to me but if you read a few years worth of Accidents in NAM and you'll be hard pressed to find an accident that was a result of a biner gate being rubbed open against the rock. If it was a more common occurrence I might consider buying heliums or another clean nose biner but since it isnt I am happy with my cheaper biners.
WRT freezing shut I've had all sorts of wire gates "freeze" shut... trangos, bd, etc... A few wacks from your ice tool and they're fine.