Why are there so few Runeterra-fitting skins?

Nearly all of the skins released recently are takes on what a League character might be like in a different setting. We have old-school arcade characters, superheroes, mecha, robots, computer programs, university students, nurses and doctors, news anchors, mafia enforcers, heavy metal bands..., plus modern concepts such as pool parties, chefs, boxing, basketball, and then joke skins and many more.

However, there are very few skins that show alternate takes of the character that would actually fit into League's setting, and the output of such skins has only decreased in recent years, even while the overall number of skins has risen dramatically.

I'm talking about things like High Command Katarina, Tyrant Swain, Woad Scout Quinn. Skins that answer questions like "what would Katarina look like if she was in command?" or "what would Quinn look like if she was from the Freylord?", as opposed to ones that answer more fantastical questions such as "what would Ashe look like in a science-fiction setting?"

http://i.imgur.com/HBgW9Bv.jpg

Why are there so few skins that look like they actually belong on Runeterra?

I'm also a bit disappointed that Riot have said that they are no longer planning to make base-skin chromas, because an alternate colour scheme obviously fits the theme of the original character very well while still allowing some customisation.