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I've thought this before and I totally agree, with the possible exception of grass types.
Only problem with it is that it would become even more OP and spammable than it already is. It should probably be a signature move rather than a standard TM move given how game defining it can actually be.
I think its base power should be lowered way down with a guaranteed burn chance making it the water version of nuzzle with a burn; knock off should be the same shitty power as well IMO as its too low risk/high reward.
Alternatively, leave burn chance at 30% and just lower its power (along with discharge, another spam move that just happens to have a less annying level of distribution and an immunity, 2 if you count paralysis not affecting electric types) and in the case of knock off, leave it as it is but make it a chance to knock the item off.