I'll admit that seeing they are single-homed is sketchier than I assumed Fastmail's infrastructure was. I've been using Fastmail for years and I like them, but they are clearly big enough to have a second transit provider, and have been for many years. I'm amazed it took an outage for them to decide to get one. I appreciate the post-mortem but I felt better before I had read it.
Judged by comments and upvotes here, and previously, I am actually amazed how almost everybody thinks how perfect and unfallable he is and how he surrely deserves 100% perfection from the day he is born to the day his grand-grand-... kids die.