Always has been and still is now very difficult (read impossible) to accurately predict the aero wash impact of following other cars, other than by actually going racing.
If it is in fact worse or at the least not as good as hoped, then some running changes could be made, based off data collected during races. The impact of the virus on budgets might be an argument used against making in-season changes though.
We'll see how it plays out but 15% was always flagged as the first step with more to come - be good if more could come sooner rather than later.
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