The obvious downside though is at some point the show may just magically disappear from your purchased library, if negotiations between the platform and the creator go south††. I'd love to see some laws in this area where "a purchase is a purchase" to prevent this, but for now it's a risk (albeit one with maritime workarounds).
† or license leasing if you're buying digitally
†† ie https://discussions.apple.com/thread/6449826?sortBy=best
Modern piracy (the so called *ARR stack) provide UX that is pretty close to what you get from streaming services. In some cases even better - now I will use just one app on my TV to watch everything, will not be affected by Netflix/Prime/Apple/Hulu or internet provider outages when I am watching a movie or TV show, and will not have to go through 4 or 5 apps when I am searching for something specific to watch.
The UX is slightly worse when I find a movie or TV show via Plex Discovery and want to watch it immediately, since I will have to wait for *ARR to pick it up and download it, but for now I have quite a few TV shows to finish watching before it will become an inconvenience for me, especially given the fact that this stack can subscribe to upcoming shows - I can tell it that I am interested in Fallout for example, and it will monitor releases and download the show once it will become available.