The only issues I have is:
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Swain’s new splashart, doesn’t look menacing enough and has weird eyes. I wish he looked more akin to the Ezreal and Lux animation with the bigger eye, darker hair, and more expressive face.
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Lore-wise I wish his relationship with Du Couteau was explored more. It makes me wonder how his lore would have went if Irelia wasn’t right after him for a VGU. Would have Riot added that rivalry? Sorry but Irelia vs Swain is not very interesting to me. If they didn’t want to go back to the Demacia rivalry then I wish more of a Swain vs Darkwill or Swain vs. Du Couteau would have been explored. Also where is Talon lore update? Riot please. The demon arm is nice and cool but I hoped Riot wouldn’t have seen that as a replacement for continuing the crippled characteristic of Swain. Imagine if a character loses their eye and gets a bionic eye as a replacement which is actually ten times better than a regular human eye... It’s not really crippled.
Destroy then Improve 
Sorry I had to put that in there, it reminded me so much of Viktor.
Continuing on, one clever way I’ve seen the writers circumvent this problem is to add an emotional trauma attached to losing their biological features. So then the focus would be more on the psychology than the physical But Swain doesn’t have that problem, in fact he thanks Irelia for cutting off his arm. The concept of the demon arm was cool but the execution behind it wasn’t.
3 Gameplay Swain used to be a lane poke champion where he peaked in mid game and fell off hard late. The power spike seems to have changed and new Swain sucks now in lane and is a scaling carry. It just feels weird to change the identity of a champion this much. It’s like making reworked Draven awful in lane but amazing late. I would be very surprised. I don’t know how they could have fixed this though. I only have a m5 with Swain so I am not a huge expert on this.