[Samba] file share necessary?

[Geoff Crompton]

On 
https://wiki.samba.org/index.php/Samba_AD_DC_HOWTO#Setup_a_basic_File_Share 
the instructions says

  For the server to be useful you, will need to update it to have at 
least one share


What do you need a file share for the server to be useful? Isn't a 
domain controller 'useful' to authenticate machines and users even if it 
doesn't have a file share? I would have thought that this step would be 
optional, like the NTP step just above it.

Cheers,
Geoff