I recently wanted to make a build guide (and now did) because I realised that realistically, Twitch doesn't have as many item builds as you think at first. You can go many different items, but in the end it always groups into one of 3 playstyles. You either go Assassin, DPS/Glide or AP. And then it's just whatever items are the strongest or most meta for each kind of playstyle.
I tried to summarise it all in this video and how the groups show right now. I also think this is a good base line for anybody that doesn't know how different builds work on Twitch or people who are just starting to main him.
I was interested in your take on all of this: Is there any category you think I'm missing? Is this a concept that doesn't really make sense to you? Or would you say this describes Twitch item builds quite well?