Can AI build developer tools in days without giving up control?

A Bun developer says linters, formatters and other tools that were once hard to build can now be prompted into existence in a day or two. He says that undercuts a bet behind Bun: building all these tools together would be too much work for others to try. Another commenter agrees about rewrites but argues that new software still requires choosing between a bottleneck on human judgment and giving up control over details.