Why not just use NXT itself? What utility will this feature provide?
Different properties than NXTs.
Different use-cases than NXTs.
Diversification.
Ah yes, and
brings a bit of sidechain flair to Nxt. 
glad Im not the only one who saw that. and with the way BTC seems to be foundering on the subject, my guess is MS will come out long before sidechains do
Indeed.
We also cover use-cases that otherwise would have people required to wait for Ethereum. So, people can use Nxt and get started with their local currency project.
Nxt might not offer a 100% flexible solution but it is flexible enough to cover 90% of the use-cases.