No, that's not fair. Most of the products that get imported this way also have local service centres that fulfil warranty claims. The labour is more expensive and often part of a different regional company than the import or manufacturer.

I wouldn't import a Ford truck from the US and expect a local Ford garage to meet its warranty obligations here in the UK.

There are extraordinary things to consider for the consumer. A label like "grey market" helps. It's not a slight. It's just quicker and easier than saying "this was imported from a distribution channel in another country and will only be serviced in that country".