I think that there are NCLT collectors and those who don't. I don't collect NCLT's
The NCLT collectors also collect circualtion coins.
This is a situation that KP has to make a commercial decision on: what to include and what to separate out for a separate publication. Ultimately, profitability for KP is what drives their decision.
Personally, I agree with Kopper Ken, but there is a large body of opinion that is different to ours.
Most Mints around the World are currently issuing far more types of NCLT than they issuing circulating types, and there is a large grey area where some coin types are issued in many forms, some for circulation, and some not for circulation. That makes the decision for KP even harder.