Honestly, the main issue with the 1 second on Zed ult is...
It prevents you from using R-Back as Orianna is ulting you after you ult. You are DESTINED to lose that machup now unless you find some other way to bait her ulti. You no longer have the tactical, skillful choice and freedom.
You can't use W either since that would take you too far away from her to dodge her ult to be able to apply your damage to her, especially your passive. Not to mention the shadow no longer travels fast enough for you to be able to dodge her ult after you ult.
And that's just Ori. Imagine Galio, Lissandra.
Riot listen: I get that you're trying to make Zed dedicate himself to his engages, but you are going about it the wrong way. Sure it accomplishes that to an extent, but it also removes a ton of his mechanics and ability. You don't remove choice. This isn't proper gameplay design.
Not the first time Riot reduced Zed's skill cap. The other time was when they reworked his ult. But damn these are heavy reductions. I'm really finding this champion unsatisfying to play now. You are preventing people from showing off their mechanical prowess with these changes, ESPECIALLY this 1 second thing.