If I were your fellow dev I'd be mildly annoyed that the setbacks meant you couldn't see launch, and we couldn't celebrate with you, so long as I understood tha

If I were your fellow dev I'd be mildly annoyed that the setbacks meant you couldn't see launch, and we couldn't celebrate with you, so long as I understood that your hands were tied. You tried to see it through, but circumstances dictated otherwise. Communication is key. As the new employer, I'd be distinctly annoyed if you pushed back a week; they're probably counting on you and starting to schedule new starter stuff. That could colour an entire working relationship badly. Good luck with the new job!