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@GA2G
You wouldn't need to be an F1 engineer, nor any engineer at all, to realise the damage that can be done to high-revving engine, to turn it down, then turn it back up again.
Imagine an engine that revs to 11,000rpm, that is then brought down to 9,500rpms max (these are for example only). The engine would cool slightly, and be less stressed. Then whacking it back up again in a race! Even in a testing chamber, this could make the whole thing go bang. Why do you think they want to preserve the 8 engines they have, if they can just stress it however they like?