P-90 guitars are a very, very small part of worldwide production, and in the past 60 years, I would bet that all models of P-90 guitars ever made would fall far short of 1,000,000. That's why you don't route them out for HB's, which are made by the millions.
Treasure the few P-90 guitars there are. In the used guitar market, I see P-90 models consistently hold their value better than the same model with HB's. There is a fanatical following for P-90 guitars, whereas HB's are just one in a sea of HB guitars.
And my good doctor, if you spent some time with P-90's, and amaybe swapped some magnets, I imagine that you might be impressed with what can be done with them. They are making a resurgence in popularity for a reason.