So how often has something broken on your bicycle, particularly on tour? particularly an immediate break.
A bunch of years ago, on tour, I managed to throw the chain into my spokes, chewed up about 6 spokes, 2 snapped before I got to the next bicycle shop. Within 2-3 days of the incident all the chewed up spokes were replaced. Now and then a few other broken spokes for no good reason, easily replaced. Somebody rear ended me at a stop light and tacoed my rear wheel, but that was not the bicycle's fault. A few blown out tubulars because of my poor sewing skills.
I believe on the tandem forum is a thread about a cracked Al head tube. Not an immediate failure. The owner is working on the best fix.
Even Carbon which snaps in an accident will shows cracks on it's way to failure. Everything else tends to give you a bit of warning. Like cables feeling weird and stretchy. It seems most often a frame will show a crack quite a while before a failure happens.
I wish to contend that stuff seldom breaks, and if it does it usually gives you warning signs. Wearing out stuff doesn't count in this discussion.
Looking forward to your stories.