What we see is that sometimes teams and companies get carried away by the momentum, so the idea of what's possible is front and center and what's practical kind of goes on the back burner. Typically, it's usually during the build, right, so that we realize there's no way the team can deliver on the scope within the timeline and the budget estimated.
The key here is to have a rockstar project management office in place from the beginning and starting with a realistic deployment roadmap, and quick wins along the way with time-bound sprints and a team that is skilled in agile approach to development.