Opinions vary widely with regard to dedicated pipes to blends.
I usually go through a full tin before forming a concrete opinion on a blend. Except for my experience with "Troost," about half a bowl convinced me that it was not a blend for my palate. I use different pipes as tobaccos smoke differently in different sized bowls when exploring a new blend.
I won't write a review so I do not scrape my tongue, cleanse the palate and regulate what I eat prior to testing/tasting a blend for evaluation anymore than I use the same bowl, same cake, same dryness, etc. for each test. It is just not that important to me. Others, God bless 'em, do the research, develop a discerning palate, dedicate pipes to blends . . . I suspect some of them have a tiny room, hidden away, accoutered with all sorts of tools of the trade, perhaps even a brain in a jar which awaits transplanting into the hand-assembled body hidden away in a corner of the lab . . . Nor do I carefully monitor and control my diet and health.
Some here smoke different blends as they love the experience of learning new tastes and enjoy trying to unravel the blender's recipe. Others simply enjoy the pipe as a "pacifier" which provides a calming and relaxing experience or, simply delivers the nicotine. Then there are others in between, exploring always pipes and blends, while enjoying the "pipe experience."
I'm in the camp of, while I enjoy the experience of a new blend now and then, I tend to smoke a couple of chosen ones in lovingly purchased, excepting the MMs, pipes. I guess it all depends on what you are expecting from your pipe experience.