Perhaps Riot cannot deal with Bandle City...
So now, Bandle City is not a place on Runeterra, it's like another dimension where the portal shifts around the map.
So we can say that Bandle City is almost disconnected to Runeterra.
Then there are several questions arising.
For examples, how the Kinkou Order heard things about Kennen when Kennen is from Bandle City? (it makes sense if Kennen left Bandle City already or if there's a way to know what's happening in Bandle City)
Why and how could some yordles live with people in Runeterra?
Why are there troops in Bandle City when Bandle City is isolated? Does this mean there are other cities in the world where Bandle City is in? And where is Glade (where Pix, Lulu's fae spirit friend) then?
Perhaps Bandle city is related to Void.
Personally, I think Riot made Bandle City not on Runeterra so that they can deal with Bandle City later. And I also believe that Riot made things too complicated by making Bandle City in different dimension.
What do you think?