Not an old myth at all. A bigger engine is going to want more head, guarantee you a stroker will make max power lower in the rpm range than a stock stroke motor, assuming same head for both. Bigger motor will take less rpm to make its peak power.
For example the mountain motor pro stock stuff runs a couple thousand rpm’s less than the NHRA stuff, but they are faster in spite of that because of the bore and stroke difference. I believe they all use roughly the same head.