I like references, but only when they actually flow coherently. Let's use Sonic as an example, since I've been mulling over a potential rework in my head for a while. I'd personally replace some normals with Sonic Battle animations, because those are cool, dynamic, and would easily translate to a Smash moveset. Like, c'mon, this is prime forward air material
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On the flipside for Sonic, I have no desire to see him summon two Flickies on either side of him. That's random, makes no sense at all, and is really just there to make you point and gawk at the reference.
So essentially, references aren't strictly necessary, and if they're just a random reference, it'll be jarring and janky. But if the move actually
works as part of the kit, I see no reason to waste a perfectly good attack