6.2 ACL or MQC ?

Is there a reason to not use the existing MQC  vs  adding an ACL to the interface?  

SolutionGuide shows a new ACL being applied to the interface.  This seems to be the SG tendancy for blocking "Private Addresses".

For me, it seems cumbersome to have so many things on a single interface.   The only issue I see, was that it was necessary to reorder the policy-map so that the DROP statement comes before ICMP rate-limit (task 6.1).

I think that both ways are correct.   I just want to be sure that there is not a special reason for using the ACL (vs MQC).   Thanks.

Here is my config for this task:

  Policy Map FROM_BB1
       Class FROM_PRIVATE_ADDRESSES
           drop
    Class ICMP
       police cir 8000 bc 1000
           conform-action transmit
           exceed-action drop

  ip access-list extended FROM_PRIVATE_ADDRESSES
         permit ip 192.168.0.0 0.0.255.255 any
         permit ip 172.16.0.0 0.15.255.255 any
         permit ip 10.0.0.0 0.255.255.255 any