I think they should have numbered the compounds from 1 to 7 (?) then picked a Hard, Medium, Soft for each race out of the number set (eg. Hard = 2, Medium = 4, Soft = 7).
It would make it simpler to understand race strategy and we could more easily understand the relative tyre usage and car preferences between tracks. (Eg. The Williams goes well on the #3 tyres but chews up the #7's).