I voted yes, but that was because the question did not quite add up to your reasonings. Allow me to explain before you downvote.
Akali is not tanky because she has high spellvamp, that simply just does not make sense. If she is hit with hard cc, she will die very quickly as well as all of those champions. Zed is very balanced and has a huge window of weakness when his shadow is down, however Fizz late game has a very small window to be caught out and will most likely escape you if you attempt at chasing him. Rek'sai has way too much damage with tank and extreme mobility with gapcloser and a global pressure ultimate. Yes, champions should be punished somehow with having a gapcloser, and those without gapcloser should be buffed to abnormality.
If you are chasing after a car (In meta) with good speed on foot (Out of meta), it is very hard to actually catch up. So why bother? Why not just carry a shotgun and shoot the tires out (Towers) while they run away (Gapclosers) because the enemy team built a bruiser, assassin team composition. You will mostly likely have at least one squishy guy on your team always in the current meta, hell mostly everybody is nowadays because you are punished for building tank. This means assassin will not be completely useless, and require ALOT more skill.
-EDIT-
This means i believe out of meta champions should just be outright buffed to compensate for not having a gapcloser. It kind of makes sense, why give new champs and other champs new toys but leave out Olaf hanging in the wind? The dude can ignore CC and change the enemies position as he likes it, that or they just die. It would be healthy for the game.