Except, who determines the 'true build'? Why are we containing characters like that? That makes for extremely static character balance and doesn't allow people to experiment as much. Imagine, then, that Riot stopped releasing new characters and just balanced what we have: that would mean we have 134 champions with one 'true build' that's the only way they're balanced to be played. However, say someone finds an alternate build for, I don't know, Fizz and it turns out to also be very efficient - too efficient - and it needs nerfs, but those nerfs will have to hit the true build. The true build is balanced, though, so now what do you do? Hit the off build and the true build is collateral, right? Well now you have a new 'true build' because his previous one isn't comparatively balanced but his new one is. But his true build, as determined by Riot, isn't the one that's now going to be used and that's a problem, isn't it? Or is it? It's not Riot's idea, it's the players - the players organically took what Fizz was good at and made use of him in a way that Riot didn't consider to be his true build. So what can they do at this point?
You can't just decide to make a character and determine what their "true build" is once and for all, because players don't work that way and neither does balancing a MOBA. You can't just ignore offbuilds for the sake of their "true build" because that takes away variety in gameplay which is very damaging in the long-term both for the sake of variety and it will absolutely erode trust in the company knowing that anything considered to be slightly off won't be accounted for. But that's the path Riot has already headed down, isn't it? The path the doesn't want to account for offbuilds or support them because it doesn't fit their vision wherein a character has one or two things they were built to do and anything else is overstepping their boundaries.
That's not a good place for a company to go. That's how you get to a company that doesn't care about a lot of people and potential playstyles.
