Veigar's ultimate should not be an execute

I don't really like the fact they removed the AP scaling on opponents, but that's.. fine, not really problematic to his identity. The problem is, making his R an execute goes against his kit. Veigar's combo, if it lands (with help or opponent doing a mistake most likely, as it's so unreliable) has always been EWRQ. Possibility to lasthit with Q for more AP, W as soon as possible if the guy is stunned/slowed by someone else so he is likely to get hit and then asap the other spells to be able to walk away to safety while your cooldowns are down, because you are an immobile mage that does nothing while he has his spells on CD. What the execute brings goes against it : I should have to wait for the W and Q to land and then R to lasthit for better efficiency. That's effectively putting me in more danger than I should. Veigar's R never was an execute, big damage burst =/= execute, there's no need for %missing health amplification at all, that's just putting fancy scalings on things that make the use of his spells not optimal for the sake of having a spell that does not just say "deals x damage + y (%AP) "

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To be honest, that's not the only thing that bothers me about Veigar, ever since his rework. Veigar has always been THE burst mage (along with Annie maybe) with really long cooldowns and big window of opportunities if he misses. That is what his weaknesses should be. Reliable, weak earlygame, has to choose between farming and trading, has to make meaningful choices during lane about his mana, buildpath , has to make no mistakes in all ins because if he misses things, he has nothing left. He dies. That's also what having counterplay means. It's not always about dodging. Pressuring Veigar has always been a thing. What did the rework do? Make his manacosts barely comparable to what they were, reduce his CD's so now his most efficient build is 40% cdr and spam E and W until it finally hits then you can unleash doom. Window of opportunity to kill him when he fucks up being smaller. I don't like it. What they are doing about the passive and all is interesting, but I think the approach is wrong. Everytime, they took away part of his identity and to compensate removed weaknesses that were also part of his identity (smart mana management, somewhat weak laning -has to trade OR farm-, now you even gain AP by trading (? where's the meaningful choice then ?) But that's a whole other story, let's just talk about the execute for now.