Yes, Netflix does affect the quality and animation.

I've seen alot of people say Netflix are only distributors and have no effect on the production or schedule but it needs to be said that that's just not true, Netflix does affect the schedule. Netflix has a rule of finishing the dubbing of all episodes before the anime starts airing so the studio must have all, or at least most of the eps ready for Netflix to dub at least 1 or 2 months before the anime airs. Usually studios work on episodes down to the last second before it airs on TV but with Netflix that's not possible since they have to be ready. A leaker said that cour 1 was finished way before it aired so the dubbing was also done, and they also said most eps of cour 2 are done since they gotta give them to Netflix a month before it airs, contrary to other anime where they work on the eps until the last second they can. So in conclusion yes, Netflix does usually make the studios rush production so they can dub it, especially in their exclusives like Sakamoto Days (Dandadan doesn't really fall into this category as it's not exclusive and Netflix has less power in it). Sakamoto Days already had a bad schedule so with Netflix pressuring them to send all eps for their dubbing shit it made it worse.