I suspect these things happened because of waterfall development style. If you finish the product with time before the launch date, you can add in some fun. No

I suspect these things happened because of waterfall development style. If you finish the product with time before the launch date, you can add in some fun. Now, everyone uses Agile-ish, and software is NEVER finished. You always have a backlog. Those are always going to be more important to your PM than an Easter Egg.