Those are products that only exist on streaming platforms, though - as far as I know, Netflix hasn't negotiated any deals to have movies go from cinemas to Netflix and not get a physical release at all. Even some of Netflix's properties have physical releases, such as Stranger Things. So there's still just as much or more physical media available as there would be without streaming platforms.

This is patently false. Most "streaming only" tv shows do get dvd/blue-ray releases. But this is a bad-faith argument anyway, imagine all the times this has been said about new formats of any kind. Streaming is an option and does not prevent people from owning things and it isn't hurting you so maybe just let the people who want to stream things...stream them?

The films and shows that are "streaming-only" in 2019 are the equivalent of "straight-to-DVD" in the 00s.

Besides marquee projects like House of Cards, Fleabag etc, the vast majority of original programming on these networks are badly made formulaic pap with actors no-one's ever heard of. Were it not for the recommendation algorithm (and the removal of the user reviews), I doubt anybody would bother watching them.