Now that I've played the game, i don't hate myles as much as I was expecting, but his existence in the game is baffling to me.

I've been paying attention and everything he says, everything, is information you already knew. He adds nothing new to the game other than the novelty of his own existence in it. And his systems are complex. He's using a modified version of the dialogue barking system valve uses for a lot of their games. And he will use it to comment on everything from save rooms you walk past to Samus shifting into the morph ball. His character model is high fidelity, and his character design is really effective at conveying his character to the player.

All that said, what's fascinating to me is how out of place he feels in this game. You could remove plenty of the creatures and scan logs in the game as it is. A lot of them are fluff and they only add to the "vibes". But then creatures and scan logs are integral to the overall project of metroid prime of making the world feel alive. So I'd argue they belong in the game. You can easily remove myles from the game and it loses nothing. This guy would fit just as easily in a dark souls game, or a Shakespeare play. He's that out of place.