Thoughts on Zac's last buff

Zac's seen a huge rise in popularity ever since his E knock-up got buffed, but I gotta question if that buff might've overdone it. Why? Because he's able to inflict a 1-second knock-up very quickly at point-blank range even if he doesn't charge his E.

I'm not opposed to the idea of Zac's E having a 1-second knock-up, but I think the duration of the knock-up should be tied to how long he charges up the jump. As in, if he does it with a quick launch at point-blank range, the knock-up should be 0.5 seconds, but if he does a full charge, it's 1 second (regardless of how far you actually travel). Kinda like Janna's Q.

Good idea or bad idea?