When I started at Twitter, a guy was proposing building a staging environment. At that point it would have cost about $2M, so it was within the realm of conceiv

When I started at Twitter, a guy was proposing building a staging environment. At that point it would have cost about $2M, so it was within the realm of conceivable. I was a pretty immediate “no”, for all sorts of reasons. Keeping the data in reasonable shape would have been a big project all by itself, getting reasonable load on it would have been another, and then of course it’s a large environment you need to be on call for but that doesn’t have the priority production has. It’s just an all around bad idea.