Alien: Covenant retroactively enhances Prometheus for me. Nothing can totally salvage Prometheus' absurdly incompetent writing and editing in full, but Prometheus is chock full of interesting ideas (David chief among them) and it is those elements that Alien: Covenant runs with and soars.
The nature of creation and the relationship between "parents" and their "children" is at the heart of the prequel films, and Alien: Covenant muddies those waters by throwing a wrench in everything we knew (and, yes, retconning things) while telling a story that thematically taps into what made the original films so appealing to me.
So David, the repressed android with daddy issues and a lust for the very thing he hates, creates the penis-headed monstrosity that terrorizes and violates humanity for generations to come after being scorned by his creators and disappointed by the creators of his creators? That just feels so explicitly "Alien" to me, while also allowing the audience to have their cake and eat it to - yeah, David made the capital-A version of the Alien that we see in Alien, Aliens, Alien 3, and Alien: Resurrection. But at the same time, Prometheus showcases various preliminary forms of the Alien (the Hammerpede's acid blood, the gestation method of the Trilobite, the Deacon's general shape, etc.) via the Pathogen as being pre-existing, so that Lovecraftian element of the unknown, uncaring cosmic horror at the genesis of all of this still remains intact. The capital-A Alien is David's, through and through (at least, until some other story comes along and retcons this) and it is the perfect embodiment of his hatred for humanity and his infatuation with birth and creation, but there are also now an infinite number of tangential directions that can run parallel to these concepts and stand apart from David's handiwork as well if a filmmaker ever wants to explore a narrative that centers around tangential offshoots or predecessors of what we have seen before up to this point.