In my opinion, Dota now is focused on late game. They did several changes to prevent a team to snowball from start and finish the game at 15 minutes.

This means you want heroes who have impact in the late game, because the match isn't finishing too soon.

Chen, who was almost the hallmark of early game hero now has can have a strong late game presence. Better yet, if he had a good early game securing a scepter isn't far fetched.

Enchantress however… I don't think Impetus alone will be enough to make her relevant. I think right now, there is no reason to pick Enchantress outside of loving her voice lines.