Thank you so much for your question, it’s a great one! You are quite right. Toning is not a necessity, and in many cases, it’s in fact better NOT to use a toner, especially if the toner contains a lot of drying alcohols, or the of the person using that toner suffers from impaired barrier function. My advice is always to get to learn what works for YOUR skin. Unless that toner is actually performing a specific function, it may not be necessary to use it, (for example in one or two professional ranges, the toner is made up of AHAs, so they are the range’s exfoliation step). So to answer your questions simply, NO, not all skins require a toner.