Your parent comment has a point about performance; I don't see why he is downvoted. Crystal is cool, but it is still immature in terms of ecosystem, the language could change, limited library support, and most importantly, not many great engineers. Particularly not outside of the valley.

Performance is a concern for many people, and this is somewhat overlooked because of the number of people here who work for companies where scaling is the primary concern. I think this is what he meant by people outside of VC-backed startups. I know of multiple companies that have had outrageous cloud-hosting bills and have had to hire fancy consultants to fix it.