I have mostly 3a curls, and I do sort of straighten mine. Well, I curl them with a 1.25" iron and side sweep them, that is. My curl is slightly looser on front, so left natural they look odd (the curl looks strange) and they seem to blend OK.

I didn't have bangs until a few months ago - I had seen enough pictures of myself to realize I needed them. :/ I sometimes miss having no bangs, but I really look better with them.

But I do agree that really curly hair with really straight bangs doesn't look right, IMO. The curlier it is, the less it seems to work. BUT, do what YOU want, and whatever you feel looks best!
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.

Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing