Why Sion's design is terrible

Sion used to be a fun and balanced champion to play as and against, a bunch of patches ago. That was until patch 8.16, where this happened.

Soul Furnace Bonus health on enemy kill increased to 4 from 3. Bonus health on large-enemies and champion takedowns increased to 15 from 10.

This buff was completely out of place and unnecessary. Sion was in a good state before this but for the past few patches he's just been broken, as evident by the inting Sion strat that everyone loves.

I'm not sure how much sense it makes that with one cannon minion wave Sion can get 40 free HP. This means that Sion gets ~150 HP every 4 minion waves, meaning an extra 400 gold every 2.5 minutes in lane. (Roughly accounting for Siege Minion spawns).

I think the first step towards fixing Sion is reverting this buff to make his scaling more bearable. The next step would be to make it so if he kills a buff in his passive, he loses the buff. Ya know, like every other champion in the game. This would help to prevent early game cheeses on buffs and generally make him more fun to play against.

Speaking of which, I think his entire passive could use a rework. This passive promotes dying and with the right build can just breed a champion who survives for tens of seconds whacking at your team with crazy attack speed doing 10% current HP damage to everything he hits. His current passive is cool on paper but in practice it does not do well in terms of health for the game. I don't know what his new passive should be but it could damn well be better than this one.

That was my Sion rant, I think that in his current state he is a very badly designed champion that is in dire need of small-medium scale changes to make him healthier and better to fight against.