I’d add on to that lifecycle demands: a development project with no users has a tight cheap feedback loop with high quality bug reports with relatively obvious bug sources, once issues start working through layers of QA and customers the per-issue costs raise by several factors (50x to 200x are numbers I’ve seen from research, YMMV).

I would feel very confident slapping something onto Chrome ‘back then’ with only internal users. Today, with millions of users and CEO-level attention to screwups, I’d use a lot more time per issue. It’s a fundamentally different risk/reward/confidence situation.