I can see both sides of the argument on this one.
Would it not be simpler and more cost effective to have a control tyre, and for a nominated manufacturer to offer their tyres at a reduced rate for competitors?. Meaning reduced costs for us, eradicating the "which tyre saga" and providing a good marketing opportunity for the chosen brand?
Maybe its not as simple as this in real life i don't know as i have no experience of organizing meetings, just my opinion.
