Mine was worse when it was shorter and I washed it daily, but as I grew it out so the bother of washing grew. But somehow it didn’t get greasy. But - I still use that as a gauge, if I spend too much time in the climbing gym or in the woods it tends to get greasier faster so I’ll wash it more often.
I always get compliments by hairdressers on how healthy my hair is and I don’t really do much (or know what to do, admitting my ignorance on the matter).
However I’m not anti/shampoo or anything I just shampoo by need instead of by habit