Ultimately that's true, it's a marketing thing, however the big guys don't want to put crap tyres on their supercars: They want the best, so the reviews will be positive and they'll sell more. Also that's missing the one key ingredient that ultimately is more important that anything else, which is that current Zed owners have used the MPSS and are saying that they're worth every penny. Take that into account with the stats that the EU make them put on now, and you ultimately have enough info to make a decision.
Also, the PSS are not designed for top speed. That's hogwash, and I'd like to see the source that came from. They were designed to be the best all-rounder, there's a ton of development journo stuff from a couple of years back when these were being made and the journos got invited to test days.