You have a point. I mean, why even bother trying to keep giving Shuckle attack EVs? Or giving Shedinja HP? So long as it fits with your EV strategy, it's fine.
I do that things. Also I equilibrate moves.
Example: A Staraptor has got amounts of Attack, but very few special attack. So I didn't learn him any special attack move.
I'm an expert with this things!