Some stylists are better with curly hair than others. Curly/ wavy hair usually NEEDS oils.
I have ringlet curly hair. White-girl-curls. It takes apx 7-10 DAYS for my hair to even START getting oily at the roots, and that's if I'm not brushing it (I blow mine out straight as well). If I'm brushing it daily, I can go 2-3 WEEKS before my hair gets oily. Meanwhile people with straight hair tend to start getting oily on day 1 or 2.
Because I have W-G-C I can wash my hair every day and it won't get all nappy (it can and does get nappy, it's just that washing it doesn't matter). In fact, if i'm "going curly" I HAVE to wash it daily or I start getting dreadlocks on day 2. If I'm going straight I usually wash it twice a week. Keeps it shiny, sproingy, lively. My black friends, however CANNOT wash their hair every day or it just starts to shred in their hands, and even twice a week can make their hair super nappy.
At girls' nights we've dished many, MANY times on the "stupid" things people have said about our hair, because they just DON'T get curls. White girl or ethnic. The hair texture is just different, and requires different things. Even between us, white girl, mixed, or black, we have to do different things to it. Don't even get me STARTED on how snarky I get having to miss out on 'perm parties'. Stars above I would rather get together with my friends once a month and relax my hair, than spend buku bucks at a salon. Sniff.
If you've found what works on YOUR hair, have at girlfriend! Keep it up. And snicker quietly up your sleeve when people tell you to do what destroys your hair. They mean well, they're just clueless.