Is there anything bad about buying a parallel-import Porsche Cayenne, considering the Canadian version is cheaper?

You get what you pay for; cheaper means lower configuration.

Do 4S shops recognize maintenance of parallel imports?

I remember someone in the group bought a parallel imported car, and then it seemed like they couldn't log into the account or something [I want to be alone]

Are there any issues with quality or other aspects in Canada?

I know there is no air suspension, I don't care. I just hope the sunroof doesn't leak. I'm only interested in practical features like rear-wheel steering and SC.