Since my pipe collection is a little outrageous, I do have some pipes that are dedicated to specific blends, but for the most part, I have pipes that are dedicated to a blend type. E.g. I use a pipe only for straight VAs, and another for balkans, another one for VaPers, etc.
I do have quite a few different types of pipes dedicated to blend types (e.g., multiple pipes to smoke straight VAs out of) because what I have found is that some pipes will impact the taste of the blend. For example, how wide the bowl is, how deep, churchwarden vs. not, etc. All those variables, to me, seem to impact my smoking experience, so I play around with stuff and note down when I have an exceptional smoke so that I may use that pipe more often.