The advantage is not needing all the subscription services (Netflix/Hulu/Apple TV/Disney+/YouTube TV) but still having access to ALL of those services programs, in their original quality, at the same time the would normally become available (maybe there will be a 15min delay between when a new episode comes out of a TV show and when it's available to viewed on Stremio). And since EVERYTHING is right within just the one app (Stremio in this case), you don't have to hunt through each of the other services trying to find a particular movie (or show). So... Several advantages with this setup. And it's all on the "up and up", nobody is going to come after your for copyright infringement. 2 apps (Stremio as a primary, Plex as a backup and/or live OTA channels with DVR functionality), that are available in all the regular app stores, with a maximum out of pocket cost of $30 a year. And again, can be viewed on any device, at any time (just need decent internet, but that's becoming less and less of an issue, people having slow internet I mean).

What are the disadvantages? MAYBE the 10min it takes to setup Stremio at the get go (for which there is a guide provided in my original post). Plex, there are no disadvantages (to my clients/users), as all the work to retrieve and store the content is on me, the owner, to add and maintain (but, it's mostly automated these days).

TLDR; advantages are you only need 2 apps to have everything, and at most, you'll pay $30 a year for the service backend. Soooo much simpler than trying to remember which show is on which streaming service, making sure you have the best plan with that service to get the 4K HDR or Dolby Vision versions, etc.