Yeah, I keep wondering about this business model choice too. Netflix is the only major streamer left at this point charging for HD and 4K as separate tiers. The other major streamers do sometimes tier on simultaneous screens, and often refer to higher tiers as "family plans".

Netflix is at least unintentionally messaging at this point that "only families want or need higher quality streams" and that is a very weird mixed message in the current streaming market, especially now with their slowly increasingly more hostile messaging that they are tired of people sharing passwords (because the shareholders demand account growth in a saturated market with a much-increased field of competitors).