Here's some feedback if you're interested.
My issue with Eternals right now is that when you achieve a milestone for Eternals, it doesn't always correlate with having a big moment in game, and I think that's a major failure of the system.
Here's an example-- Braum has an Eternal that measures how much damage you have blocked with his E. I don't think this is a good Eternal because I don't care how much damage that my support Braum has blocked with his E over the course of his lifetime playing Braum.
If you told me that my ally Braum has blocked 400,000 damage with his E, I wouldn't know what that meant because there isn't any context as to how many games he has played with Braum. If he's played 400,000 games of Braum then I would be very concerned about his gameplay, and if he has played 1 game of Braum I'd think he was the best player ever.
I think this is the crux of the issue with Eternals. Because I don't care about my teammate's E...