I would be thrilled to get a series 6 with the stainless steel.
You can get a series 7 or 8 with the aluminum body for less of course. You’d get texting from the watch as well. Not really important to me though. The stronger screen is more important.
This isn’t a conspiracy. Apple just doesn’t want to support its older products.
Yes, given Apple’s lifecycle it should get major software updates for the next 4 years or so.
Editing videos might require more than 8GB of RAM which will significantly add to the cost though.
The back tap or double tap on iPhones is really inconsistent for me. I’d be surprised if it worked any better on the watch.