Teams do not need lots of tools
Teams get pulled in different directions when they use lots of extra tools. What happens is different habits start to form and teams are not united.
Teams do not want to leave email
One place is always better than all over the place. Most things start as email and quickly spread across lots of tools. Things get lost, you end up balancing work across different places.
Teams do not need many ways to do the same thing
Teams that work in different parts of a business do not always require different ways to get their jobs done. Tasks can be managed the same way, teams can collaborate the same way and communication can be done the same way. Processes can be repeatable.