Why isn't the story team pushing for another type of game set in runeterra?

So I was watching the trailer for warwick's reboot and there was something pretty glaring about it. So here's the thing: Riot's story team wants to tell stories and show off all these places hinted about in the world but you can never go there. You can never see it or explore it. You get stories, events, and maybe a temporary map with a theme of that place, but you can't really go there.

The core game is so tied to one map in SR, you can't really see or do anything. At least in overwatch we get a dozen maps of different locales with different game types (stupid hanamora).

So why isn't riot making a second game series where they can better show off the world and let us see it and explore it? It could be an MMO or a large scale RPG which gives people just a taste of everything or it could be like the elder scrolls series or dishonored were we could get a detailed close up of a single area. This would help with another issue in that LOL is perpetually stuck in time (more or less) but the world and the story needs to move forward.

You guys are obviously trying to do something you can't with LOL, so why aren't you trying to make a product that furthers that end?