Exactly. Thank you for putting this up.

In theory, excel should be good enough. But its only good enough for one person. They dont have the context of the whole project most of the time. So at no point is it optimized for everyone involved. Also God forbid someone leaves the job for any reason or goes on vacation. Even a shared Excel between teams, you go on vacation, come back and all your tasks are gone/messed up/they are using a new document for new projects.

In practice like one tracker that is maintained by the team that gets you 70% of the way there is good enough. And yeah it sucks when teams are moving from one to another.