Yes, some rubbing of your hair is unavoidable, and your hair is fragile when wet, but from what I understand, it's also a bit more elastic when wet. When co-washing your hair, you're focusing on massaging the scalp, and any pulling or stretching of the hair that might happen when co-washing is apparently well within the hair's tolerance. Otherwise, all of us who regularly co-wash would have damaged hair and split ends, but that's not at all the case. Lots of people who've adopted co-washing (along with other proper haircare routines) have healthier hair than before when they'd regularly shampoo their hair.
3b / Fine / Low (to Med) Density / Normal Porosity & Elasticity

Currently Using [*Holy Grails*]
Cleansers: DC No-Poo / DC Low-Poo / *BaSo & ACV*
Co-Washes/ROs: CJ Beauticurls Argan & OO / DC OneC / Organicals DC Creme
Additives: *Silk Amino Acids* / Honeyquat / Fragrance Oils
LIs (found some!): KCKT / CJ Beauticurls LI / CJ Curl Assurance Smoothing Daily Condish
DTs: *Coconut Oil* rinses / *Honey*, EVOO, & DC OneC / CJ Curl Rehab
Sealer: *DM Super Buttercreme*

Goal: APL Hair