While I agree to an extent, I don't think you made the best case here.
We don't have basic champion height/weights
I like to think I'm a fairly passionate person about series I love: video games, books, a select few anime, etc. Despite that, I would not know how tall pretty much any of the characters I love are, nor would I care despite spending hours and hours investigating their worlds even outside of the media itself. Furthermore, if I did care, seldom will most of the series have something like a size chart. That is not a common thing to have at all.
It's made even muddier when releasing such a chart, if they did, will only further make a disconnect from gameplay and lore if it mentions how tall something is. You may recall something of the sort happening when Galio was released? Fans were taken aback at his size and many were confused as to how any of the human champions, or even his rival, Sion, could manage to fight him and win. Speculation is good, confusion is not, disconnecting gameplay and lore is typically not the best thing either. A Rioter responded and basically said Sion would tackle Galio's foot really, really hard, and fans were seemingly not all that ecstatic about how obviously silly this idea was.
We don't have a world map.
I did say I agreed to an extent and this would be it. It should not be difficult to make a world map, you could easily have a rough map "found" in an archive or make it something Ezreal made up in his spare time (he doesn't need it after all so losing it wouldn't matter) if you don't want to use the resources to make a very good version. It's not the best, but it's something if you're holding out on the "big" map.
We don't have basic tech levels
I disagree that this is a good thing to have, especially in a setting as weird as League. There's plenty of settings where the technology they have available doesn't always add up to what you see (Attack on Titan has space-age 3D gear, black powder cannons, plus the Titans). The more detail you add, the more evident contradictions start to be once the gaps in technology start appearing. This area is one best left vague imo.