according to node-requirements rfc-4294, dhcpv6 is infact optinal. however, for an enterprise network, the fact that any v6 capable device can get a legit address is probably not such a good idea (it can be argued the other way also ofcourse).
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In an enterprise network, if unauthorized devices are getting access to your physical network, you might have other issues. :-)
At the last big company I was at, we did DHCP over IPSEC and IPSEC polices blocked everything and anything not authorized. Crazy secure.