Hmm, the way I see it, in a perfect world (with both competent and trustworthy stylists and clients [because everyone keeps a little info to themselves on occasion...]) all chemical services would be done at the salon, and this product would be used in the process
. It's amazing. It's got the lowest pH I've seen for a hair product (save for some Paul Mitchell products back in the day)
Long story short--it resolves porosity issues like no other and prevents future porosity drama (for even results with chemical services). I used it with the other 3 steps in the 17 minute kit in my self-relaxer process (instead of neutralizing shampoo).
But are you missing out on an important step? Well if you don't know what you're doing re:chemical services, then no. You can use acidifiers like creme rinses or leave-ins during your regular wash days and over time it'll provide the same benefit. But if you are an avid/experienced home colorist or self-relaxer, then it's a good product to have to ensure even proper results.