User blog comment:Ahri-chan/A concept on co-op vs. AI/@comment-24852115-20150105030313

Just one champion can be a pain to code in a bot's AI for without having the players worry about bugs, and this is doubly true for champs with complex abilities (Azir, Yasuo), kits that require adaptation (LeBlanc, Jayce), or just finicky spacing/aiming (Orianna, Vel'Koz). While I would love to see more bots available to fight, a good bot is extremely difficult to pull off in a game where every little decision can count. There's also the whole worry of how bots are fully capable of pulling off flawless combos without worrying about misclicks or the like; after all, why do you think there aren't any assassin bots? (bar Nidalee, of course, but she focuses on utility anyway)

As for other hurdles, keep in mind that bots don't see a map or stats quite so much as they see Point A and Target B. They don't Flash over walls, they don't notice jungle mobs, and they don't care how dangerous you actually are when they come close enough to engage. It's not unrealistic to see a Jax bot in a slow game back away from you under its own turret, even if you're a low-damage support or tank who he could easily 1v1. Similarly, bots will happily go ham if you fire off an ability salvo, regardless of how low your cooldowns might be. Their AI will never be perfect, but there's not much we can do.

As for the queue ideas you had, it seems like a good concept, but I feel like it should have a softer separation. For example, have players unlock new bot difiiculties at SL 10 and 20, with rewards for the previous level gradually falling over the next 5 levels, after which they stop giving you IP/EXP altogether. This would keep level 5 newbies out of the signiificantly more difficult Intermediate queue, while discouraging high-level players from grinding off of the Beginner difficulty, which may as well be punching bags by that point. However, it would still allow high levels to play games with a friend they just invited without skewing the matchmaking too badly. These are my ideas, at least.