because you don't consider that my in-sample data is all the meaningful data there is

my out-of-sample data is tomorrow's failure

what else you want me to test it on?

different asset? generated white noise? Mozart's 40th symphony?

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WFO moves the starting point and tries to find best optional parameters

I run it on full history and don't parameterize strategy apart from stuff that controls position size

(although occasionally I do slice it up and analyze particular week or month to gain insight about most conflicting parts)