Its very simple Donskar.
3 Cosworth powered teams have come out and said that they would either protest the "off throttle blowing", or that they requested "clarification".
The problem with retarding ignition and burning fuel in the exhaust pipe, and doing so differently for 3 teams is expensive for Cosworth.
They entered F1 on the premise of an engine freeze, and they have budgeted cost into the customer engines. The margins will of course be tight, hence why any further "arms race" would end up costing Cosworth money and even the potential to supply at a loss.
Developing EBD off-throttle blowing may be too expensive for Cosworth to justify. They already have a system, but it does involve continuous refinement as we have seen with many non Cosworth powered teams.
I would bet my life Cosworth turned round to their teams and told them any additional EBD development would have to be footed by them. In turn, the Cosworth teams would be hamstrung by not having the most effective EBD on the grid.
There is far too much pointing in Cosworths direction with this. As if to add even more fire to the inferno we have this on Autosport on Saturday.
With new regulations, while being welcome from the point of view of innovation, what would never be welcome is creating a financial space race. That is not what we want at a time when we are emerging from the most difficult economic time for many, many teams"But what we want to do is to be in F1 long-term and to provide highly-competitive engines, but engines that are also affordable and sustainable for our customers – because without that there isn't a business.
Cosworth may be an engineering firm, but why are they focusing on the cost when the regs havent even been decided yet? I'll leave you be the judge of that.