I'm not going to speak about my personal practices, but I find the current landscape of streaming services unusable and unsustainable from a customer perspective. I share a Netflix and Prime account with my parents, and support for that is soon going to end. I don't feel like either of those services provide enough value to me to consider paying for them entirely by myself. The content is mediocre at best, finding an…
My household has one streaming service at a time. We have lists (shared reminder lists in iOS) that we make for whenever a friend mentions a good movie - it goes on the Apple TV list, or Disney plus list, etc. then once enough films build up (can take 2-6 months sometimes) we purchase a subscription and watch all those shows for one month.
I generally want my lists of books/films/music playlists whatever that I've seen, reviewed or marked as "to watch" to be managed seperately from any one particular vendor, and owned by me.
There seems to be some movement towards this with e.g. smart TVs that will search all your apps for shows, and sites that will tell you where a specific film or show is available, but I've not seen anything either super geeky, or super easy to use.