Unfortunately, streaming quality isn’t as high as Blu-Ray quality would be. And also unfortunately, if it’s not released on physical disc or, at minimum, a purchaseable download (versus streaming subscriptions), working on an edit using material from it would mean that edit can’t be discussed at fanedit.org or listed on IFDb due to their extremely strict “own the source” rule.
Sadly, though, I agree - it’s unlikely that The Mandalorian will be released on physical media in the forseeable future.
If something isn’t commercially available on physical media, I feel like being subscribed to the service where it is commercially available should count as “owning the source” for the purposes of fanediting.
It’s very explicitly against fanedit.org’s rules, unfortunately. I don’t believe we have as strict a policy on that here.
They do allow purchasing a digital copy (e.g. from iTunes or Amazon) as far as compliance with their Own the Source rule, but simply being subscribed to a streaming service, even if that’s the only way one can access that particular content, doesn’t count. You have to be able to pay for the specific movie/show you want to edit in order to comply with their rules. For instance, Stranger Things edits weren’t allowed over there until the Target-exclusive BR release came out, and season 3 is still off limits on fanedit.org until a physical release exists.
Again, I don’t believe the rules about that here are as strict. There’s already a Mandalorian edit available here.