NonprayingMantis:

 

4) provide total support for any and all customer CPE, even super complex bits of kit that only a few people in the world own.   (there are no ISPs in NZ who would do this AFAIK, because there are simply too many different parts and combinations of parts to have that much knowledge)

 

How about I use common models routers a whole bunch of others use?

Why, that sounds like "common (?) sense" to me.