There is not one switch on a cooktop that disconects all ungrounded conductors. Cooktop must have a disconect or lockout on the breaker.
Agreed that most switches don't. Thats why I said "May be considered"
So I assume that's a yes to my question, provided that it disconnects all ungrounded conductors.
Sounds like 422.34 in most cases does not apply (because it does not disconnect all ungrounded) and the locking device is required (or visible).
I just know the locking cb rule is not enforced around here.