I'm currently using Gosu.ai in LoL ...it does provide some in-game commentary, basic strategy while events occur in the game. It does try to identify the "strongest" player on either side as the game progresses. I don't think this is crossing the line and could be helpful to new players. Crossing the line would be something like "Ezreal has 194 health remaining, your ult can finish him." There are other plugins that tally up the gold spent by your team and their team and try to estimate some gold advantage but it doesn't account for how much gold players are hording in their wallets.

I just tried Sempai.gg but it died about 5 minutes into the game (went black) and now won't restart. :-) It seems to provide similar information/analysis as other similar apps like Porofessor and other Overwolf plugins. I'd love to chat with the team about a wishlist of interesting stats culled from my own game history that could be useful to me.