[Samba] why join domain

[brucehohl at access-4-free.com]

I've set up a test Samba PDC with a few test shares.  From
the first Windows PC I logged on to a local computer account
and mapped drives to the shares on the Samba PDC.  From the
second Windows PC I joined the domain and used a logon
script to connect to the shares.

My question:
What are the benefits of joining a Windows PC to the Samba
domain?  Both arrangements above appear to meet my needs.
Thanks for any comments.