League has a strategy issue, in my opinion.
I think that League has an issue with strategy, mostly the diversity of strategies that can win you the game in solo queue. I mostly noticed this after playing TFT. In TFT, the champions have some obvious synergies that stack together when you have a certain number of them on the field. League has certain synergies like that as well, such as braum/lucian and irelia/sejuani, but they the game isn't really catered towards creating team synergies in solo queue as much as it is catered to "pick a champ you like and play it your way to the best of your ability". that might just be a low elo issue since they dont care too much about champ synergies.
However, I think that adding small utility bonuses for teams would be benefical if you have several of the same class/faction/style champions on the same team. I think this will add a set strategy for teams to play around and ultimately make the game more interesting than just: do well in lane, group for baron and dragon, and hope to God that your bot lane doesn't feed their butts off before you can get out of lane.
Its just a simple idea that I thought was worth talking about.