What is even the point of doing Vel'Koz's ult at this point?

What is even the point of ulting with Vel'koz? Am I missing something? It feels like I am doing even less damage after a combo string of all moves. It feels as if Brand and Malz got the better end of the deal over Vel'Koz. Yeah, I understand that his ult does true damage but it feels much much weaker. I had a Leona in bot lane, not building MR, eating up my combos like it was nothing. I don't understand. Every other mage champ got some godly thing, but Vel'Koz had one major part of his damage taken away. I am of course talking about how his ult now doesn't allow him to proc his passive after this patch.

Is there an adjustment as a Vel'Koz main I will have to do to try and compensate this? Can I no longer support Vel'koz and install fear into my enemy? It just seems weird to me that, where every other champ has usually a point and click move set got stronger, but one of the champs that requires a constant understanding of movement for almost all of his moves, as none of them are simply point and click on champ, will be punished so much.

Also, I really hope to have boot enhancements back sooner then later. It allowed people a chance to build up their champ their own way just a little bit more.

Rant over TL;DR Did Vel'koz ult become weaker without procing his passive? What can I do to play him better with these new patch updates?