On a fundamental basis, I agree with the opposition to bootlegs. I personally don't watch them. But I live in Manhattan, and can easily go and see a show any time I like. For many theatre fans, this is not an option, and that's the grey area for me. Many will never get the opportunity to see shows they love, or see shows that closed many years ago, without bootlegs. It's about accessibility, and for most, Broadway is simply inaccessible without bootlegs.
Stagedooring after a show you didn't see, however? I don't think that's "stealing" at all. Again, many young theatre fans love shows like Hamilton and Dear Evan Hansen, but can't afford tickets to see them live, but still want to meet the cast members of a show they love so much. Many people come to matinees of those shows due to cost and availability, and then stagedoor the night show, as many cast members don't stagedoor after matinees. While the rest of your article makes perfect sense, I simply do not understand that part.