Because what you see here on fan forums, and probably the internet in general, isn't a good indication of what global audiences think.
Covenant's box office was disappointing, but it wasn't a total disaster. It made some money and generally both films received pretty good critic reviews.
Quote from: PAS Spinelli on Jun 04, 2020, 10:21:15 PM
That's also not mentioning how turning the Alien into the child of a sexually frustrated robot is a direct downgrade of it's earlier vague origins
Subjective, really. Plenty of people like the thematic depth it provides, and I have warmed up to it as well. But if they're going to do another film they can always decide to go another way, as there's room for it.