Vinegar will not "certainly" make your hair hard, or shed. That depends on your hair and water. I use vinegar daily, I have a spray bottle with vinegar diluted in distilled water that I spray over my conditioner every time I wash, thus helps add bounce and shine to my hair, and I have no dryness at all doing this.

I will often add baking soda to my shampoo when I wash before a pt, and I add vinegar to my gelatin mix for my pt. I wouldn't do either afterwards though, I just use the conditioning to remove the treatment

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2C, Medium thickness, Low posity
Recovering from a year of keratin and bleach with CG

Routine

Low Poo, Condition, Leave in, Curl cream, Supersoak, Gel, Diffuse on high heat, with minimal lift to encourage waves and reduce frizz, Dry on cool with nozzle down to smooth hair and finish drying,Shine Serum

Weekly gelatin protien treatments.