Veigar is not built around zone control: Why Veigar will never be as good as Viktor
And until Riot realizes this, these changes are never going to let him be a strong pick again.
He doesn't have the kit for it, and nothing short of a larger scale rework (please god no) is going to change that. His kit was very delicately founded on the premise of "squishy, low-ranged caster with potent scaling and insane damage who relies on a stun to land his burst." He is not, and shouldn't be "medium-ranged caster who relies on trapping opponents to deal his damage."
For my best comparison, I'd probably have to look to someone who's much more well-designed to function in that facet --
and there's a few reasons why.
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His kit is DESIGNED around a strong zoning/burst mix. Viktor's kit naturally lends itself to being able to keep people far away from his threat radius thanks to... well, everything. Power Siphon allows him to kite mercilessly, Gravity Field gives him powerful crowd control, and Death Ray establishes him as someone who can nuke you from a distance and a powerful AoE threat. Veigar's... doesn't really do that, and even with his Q hitting two people (or being able to at least), it's still clear that he can only function as a single-target delete button.
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His zoning tool is miles better. Veigar's E was good because it was an instant stun. And it was instant for two reasons: firstly, it's a very odd ring that will only stop him from being torn apart from inside his "cage" if he manages to hit you with its edge; and second, he needs an instantaneous stun a LOT more than Viktor to survive. Viktor's kit is much more forgiving because he has both more immediate damage AND strong durability thanks to his shield, not to mention his speed boosts from Power Siphon to keep him able to maneuver around enemies.
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Viktor's role has already been defined for the reasons above; he has his niche. Veigar was established as a reliable burst mage who made up for his relatively poor stats, considerably short range, and constant vulnerability with a powerful stun and obscene damage to one person. This is the role at which he alone excelled at, and I could argue all night that Veigar was fine with it being instantaneous. In his current iteration, he isn't going to be strong without either overloading his simple kit or adding some actual, creative complexity to it that both fills the massive gap in power his kit has right now as well as lends him to his own special niche that nobody else can fill. There have been a lot of suggestions that were frankly fantastic in providing additional synergy with his cage to make it feel like an actual prison of magical torture and I would gladly accept the unreliability in exchange for a more fulfilling champion. The current changes on the PBE that let him combat (most of) the mobility creep is a good step in the right direction.
tl;dr give Veigar back his niche or push him to one similar, but don't try to change his identity to one that someone else already has