^ Yeah I don't think I'd have a problem with them if they worked like that. The reason I dislike them is they're basically identical to the disc in function, thus making them unnecessary, yet also seeming way less practical in how they're used, with no obviously visible reason for how they work the way they do.
Granted if we're talking about "realism" the smart disc would also probably be deadly as hell to try and catch when it came back to you, but at least the lights and sounds indicate technology is in play, so we can take it as having some sort of guidance system that likely helps with it returning to the user safely. But the shurikens seem like they'd be impossible to catch without slicing your hand off and just operate 100% on the "rule of cool."
At least The Predator tried to explain them a little bit with the mention of them actually having some sort of tech that seemingly has them home back in on the wrist gauntlet or something, but even then the results were exactly what I've always figured should happen with those things.