Been there and done that! But my crash occurred at very slow speed. And the bike that dumped me was an early eighties
Olmo Grand Prix that I had purchased earlier that day at a local bicycle shop.
These days, I spend the last part of a build checking everything just before I start my ride. And the torture tests are always conducted at slow speeds, out of traffic, and within walking, or crawling, distance from home.
I should add that this advice is for mom and dad also. Do not think that the so called mechanics at the local department store don't miss things also. Those dept store bikes are, sometimes, very poorly assembled. Check everything before the kids apply their own torture tests.