I think most of the problems/issues you mention matter for any organization that wishes to adopt an Agile way of working.

For the "laggards" (to use Moore's model term, the real point is "the last thing these organizations want to do is change" which is what makes them a latecomer. They are late because change wasn't desired or seemed so overwhelming and difficult that people simply live with what might not be optimal because it's what they know and at least have some comfort with because they know it.

I do agree with you saying their advantage is that they can learn so much from "the missteps and successes" of others. The question is do they want to do that and then can they?

When I have trained/coached people, I do hear "we can't do that here" when I present some of these learnings of others to them.

As Alistair Cockburn has said, “Agile is an attitude, not a technique with boundaries...so we wouldn’t ask ‘can I use Agile here?’ but rather ‘how would I act in the Agile way here?’ or ‘How Agile can we be here?’”

Will the latecomers take that first step of a thousand miles and not try to move ahead 100 miles at a time?