It's true you can't tune for performance and worry about temps...it will always be high...at least in most engines and most places.
That's why engine manufacturers keep increasing the size of the cooling head.
For example the new O.S. speed, the new O.S. VG, the RB S3, Radical, SH, ...
You can't have the same cooling head for all over the world.
In very cold climates you might need a head of an on-road engine...and on hot climates you might need an off road head on an on-road engine to keep the temps down.

You have to make sure that you have the right cooling head for the climate you race at.IF you care about your engines...!!!
The best case is to have the temps at a safe level and still be able to tune for performance.