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That's true, but following that logic, battles also "added slowdowns" due to reduced speeds, albeit to benefit tactics. The question is what is more valuable. Plus, consider that the length of a hero's turn will be significantly increased.
However, Dirman writes to me in ICQ that technically it's impossible to do this, to nullify or reduce a turn when heroes meet, because the event isn't triggered (unlike meeting neutrals). If that's the case, the concept will have to be revised in any case.