I agree that it has become extremely annoying, though if you look around international forums you can find many of the same complaints.
If you are organising information, I would suggest making sure you distinguish between the different ways Asian SWs are marketed/accomodated.
1. Independent girls who run their own bookings. These are almost exclusively residents (like the non-Asian independent Kiwis). Tanya, who posts here, and many Kiwi girls who post here, are examples.
2. Agencies that are obviously agencies and work out of fixed premises. Some have mostly Kiwi girls, some just Asian, and some in between. Some are in large buildings, some in suburbs. An example of the latter would be Pillow Talk (houses in Petone and J'ville) in the Wellington area, Stella House in Christchurch.
3. Agencies that are less obviously agencies and work out of suburban houses.
4. Agencies that are less obviously agencies and work out of motels/hotels (though sometimes apartments).
In principle, adverts on NZG and Escortify will tell you whether they are agency or independent, but many agencies seem to just put down "independent".
In my experience, the first two categories are generally not seriously problematic. Some attributes may be exaggerated, the girl may be older than advertised, some may not be that great. However, you're generally meeting the person you think you were going to meet. However, there are advertisements posing as category 1 (independent) who are really category 4, which is a problem! See below.
The third category is a mixed bag. In some houses in Christchurch you get the girl that was advertised. In some others, not so much.
I've little experience with the fourth category, but it seems to be the most problematic.
@sbq has written extensively on this category in Christchurch.
What concerns me is how the fourth category is impacting on girls in the first category. Several touring (NZ resident) girls have complained that punters have been wary of them because of the B&S they have had from agency girls in motels (category 4). It does those girls a significant disservice to conflate particular motels or locations with B&S agencies.
How punters deal with these issues varies. My approach is to check reviews and mostly stick with independe girls I know, or who are recommended, and the agencies in the second or third category that seem to be generally reliable.