[mywittyname]

People who have been in the trenches for years tend to have difficulty ignoring the current system and its limitations when building a replacement. So they end up rebuilding the same product over again.

I've seen it a lot and have been on both sides. Newly created teams have a massive advantage when it comes to replacing existing systems because they avoid getting bogged down in the details. However, they do invariably miss implementing key features in the new system, leading to a situation where the new system is better than the old one only 80-90% of the time.