'I really don't quite understand yet how this is going to work, exactly' is kind of hard to square with 'The solution to Scalability'. If one does not understand all the considerations, how is one able to meaningfully advocate it as any kind of solution?
Like anything else in life, if it's difficult to figure out at first, then continuous exposure to the logic of the inner workings will eventually bridge the gap. That's how I learned about Bitcoin; not over 2 days worth of reading/thinking, but over 4 years. I'm still going.
Fair enough. The difference I see is that when I entered the Bitcoin world, it was already a demonstrably working system. This SegWit thing, OTOH, which is merely said to have been tested, has in my mind the burden of proof. Is it an answer to the scalability issues? Maybe ONE answer - but seemingly a short-term minor fix even if all claims are validated - certainly not THE answer.
So by all means, let us investigate the efficacy. But in the meantime, let's not shout down those that are asking reasonable questions, and let us not argue for this on the mere appeal to authority. That is not how one sciences.