Interesting point, which a little bit implies that Williams would have the best aerodynamics by now. But clearly that is still not the case. So I am quite skeptical, whether CFD time has indeed the effect it aims to have. We all know that knowledge which you build up over time as a developer pays in long term. So even thou teams like Mercedes may have shorter time for CFD, they have the knowledge base build up over time which they use heavily.
Also, keep in mind that this year the rule is only in a demo mode. The first team has 90%, the last team has 112.5% of the dedicated time. From the next year this will change to 70% and 115%. (The time for the teams between is defined in steps of 2.5% this year, next year 5%)
Exactly CFD time does not necessarily correlate to effectiveness. The saying "all models are wrong but some models are useful" definitely applies and if you make incorrect assumptions your CFD will not be that usefel
