The industry should get down from its egocentric ivory tower and start hiring like other industries. You are not special, tech. Just have a sort of bar exam you have to take every x amount of years. The actual interview should just be an in-person behavioral one, with your future boss. Period. Don't get enough signal from that? Sorry, that's life, taking risks. Imagine trying to open a business without taking risks, and only kickstart it once you are a 100% sure it will work. No other industry is as delusional. Here is a reality pill: what you are asking, a 100% safe investment, is impossible, as any economist will tell you. "Campfire", give me a break, grown up adults with families don't have time for that Silicon Valley wankery, and you have no evidence that the results will be as good and unbiased as you think they'll be...thanks for bringing attention to the subject though, and in passsing also confirming how garbage the Google (and FAANG, in general) hiring process really is.

Just one more thing: the industry should really put a bit more weight on measuring people's potential and the concept of long-term growing and learning on the job. Just saying. You know, like every other industry on this planet.