- it is easier to assess the tactical situation if you can see allied deaths and leavers in real time
- it is easier to give cross team support
- it is easier to communicate and coordinate between teams if teams can be called out by the name of their leader
Edit: bonus points to devs for making the allies roster collapsible so that if you prefer your screen real estate over random lists of names you can just minimize the allies part and mind your own business (thanks Tyla for the suggestion).