I figure it also depends on how much stuff you actually watch on Netflix. If you only never saw any previous Coen films on there, for instance, they wouldn't be pushing Buster Scruggs on your page. And if they don't have enough info on your own viewing preferences I guess they'll try pull from the average person of your age/location/gender. Or Facebook friends maybe.
Sure, if they do the Amazon thing or basically traditional distribution that means they generate a bigger cultural impact as the film goes through what the film media is accustomed to in terms of how it's released and advertised. BUT for a lot of the sorts of films Netflix releases, even and especially Roma, this comes at a cost of messy as fuck, if it exists, international and regional distribution.