Cetyl esters are indeed an emollient ester.
Cetyl Esters-Conditioners, Thickeners, & Structural Agents-Home-Blending Nature and Science - Innovative Natural...
My curls were poorly defined, weighed down and totally limp IIRC. Initially I thought I was overconditioned which seemed strange given I have damaged porous hair, then read the conditioner ingredients and found amodimethicone and cetyl esters. Shampoo'd with cocoamidopropyl betaine and hardcore protein treat which my hair HATED, but it's worked out for the best, I've learned my hair likes proteins in an emollient/ conditioner base much more than the hard drying type treatment.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.