Ridley is better with original Sci-fi. I mean, who is complaining about Blade Runner, The Martian and Raised by Wolves? He's not a sequel or franchise kinda director. He even admitted that he doesn't like to repeat himself. Plus those "the beast is cooked comments".
While Alien Covenant wasn't bad at all, it's already been done so much better with Alien.
Prometheus would have been much better with a decent script and as a non-Alien film.