The 0,25s importance: Sion and the Veigar effect
Just recently i'm seeing more and more posts: "Boards are so stupid and sheepish. Veigar was considered UP, but after a small 'QoL' buff he was 'discovered' and suddenly everybody's complaining about how op he is."
Let me point the situation out:
In patch 5.18 Veigar was buffed, particularly the W delay being reduced by 0,25s. This buff effectively may seem small, but let me elaborate why instead i belive such a tiny change makes all the difference in the world. Facts are, pre-5.18 he was decent but not good, and thus rarely played; post-5.18 he became an OP and FotM. Why? Only because people are "stupid and sheepish"?
This brief time window of 0,25s is what allowed Veigar to practically USE his W: before the changes, even landing a stun did not assure his W to actually hit the target. This was harder than any number nerfs could ever be, W being so unreliable that it effectively was a 100% damage reduction on a spell on which a lot of Veigar's power budget is concentrated. Since Veigar was repeatedly buffed in other areas to help him survive with this unusable W, as soon as W became an active part of his kit, he suffered a massive power increase that pushed him over the top.
Now you're all asking: "I came here for Sion. SION WHERE?"
Sion's actually suffering the "Veigar effect" on his W. He's in a sorta-ok spot right now, except for his 3s second delay W: just like Veigar's, the excessive unreliability of the spell de facto means a 100% damage reduction on Sion's W. With Sion being unable to proc his shield for damage, he loses a LOT of his laining power, and ALL of his (reliable) damage threath in a teamfight (remember: Sion's shield is the only thing that allows him not to be completely ignored in a teamfight). I think reverting this and only this nerf is actually reasonable, and buffing other parts of the kit could do more harm than good, since his W is fundamentally the core issue and compensation elsewhere will result in a really OP clusterfuck if his W becomes usable again sometime in the future.
TD;LR: for fuck's sake, revert this 3s delay nerf on Sion and call it a day.