Why hasn't Malphite's ult been changed in some way to give more counterplay?

Malphite's ult has long been criticised for lacking any real counterplay. So why in the long time that Malphite has been around that he hasn't received any kind of balancing? AP Malph is coming up more often recently (Or at least in my games, not sure about everyone elses) Even a small channel like Lux's ult would be *something*.
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