Dear all,
I am an assigned INT directorate reviewer for draft-ietf-6man-pio-pflag.
These comments were written primarily for the benefit of the Internet Area
Directors. Document editors and shepherd(s) should treat these comments just
like they would treat comments from any other IETF contributors and resolve
them along with any other Last Call comments that have been received. For more
details on the INT Directorate, see
https://datatracker.ietf.org/group/intdir/about/.

I think the draft is of great value for better operational efficiency and very well written. Thanks to the authors!
In addition to points raised within SEC and GEN reviews - I could only find some nits or IMHO useful clarifications as listed below:

p.1:
IA_NA => Identity Association for Non-temporary Addresses (IA_NA)
p.2:
Prefix Delegation => Prefix Delegation (PD)
VMs => Virtual Machines
p.3:
15 devices connect => 15 devices have been connected
p.4:
ULA => ULA (Unique Local Address)
indicates that that the network => indicates that the network
as follows: => as follows (see Figure 1):
p.7:
this problem this is => this problem is
p.8:
rule 5 => Rule 5 of [RFC6724] 
RFC-Mandated Behavior => RFC-Mandated Behaviour
p.9 (2x):
doesn't => does not

Thanks and 
Best regards
Dirk