I think I prefer the open world Assassin's Creed but I like Angelus would love to also see a return to classic formula but one which is improved upon. AC Mirage WAS a DLC for Valhalla turned into a full game so I don't think it can be used to say "classic AC will fail" because it hasn't had the full effort of a full fledged title put into it from the beginning.
Having said that, I think my issue with recent AC is more the tone than the design, it's called Assassin's Creed but the Assassin's barely feel like they are apart of the world anymore, there is barely any focus on the creed or guild, it's more following mercenaries or fighters in their conflicts with the assassin's popping their heads in from the side-lines like "hey we're still here, help us out"
And also I will say even if open world is preferable, it can still be a lot better, I really disliked Valhalla's world.
