That’s just because SfB was being killed and replaced with Teams. So if you used SfB, it stands to reason that you would want to keep using its direct replacement. It would have been silly to just tell you “SfB is dead” and then not give you a replacement.
If I was informed that Skype was going to die I missed that notification. I was given 30 days notice and no choice. We didn't have to use Teams and could uninstall it but its not clear I could have blocked the install.
