This is an interesting topic. If, 50 years ago, a forum such as this could have existed, most members would likely have little or no frame of reference to respond. My experience of over 40 years certainly began with a a sampling of the then available drug store blends, settling on Borkum Riff. It was only later that I discovered L.J Peretti and their great in house blends as well as Balkan Sobranie ( both black and white). I wish that I had saved some of those.
There is certainly nothing wrong with enjoying just one blend. How many of us smoked 1Q for years. But, there are so many great blends now available and, for me, sampling a variety, while hit or miss, adds to the pleasure of pipe smoking. I now mostly return to core group of my favorites (wessex original dark fragrant, old Gowrie, Devil's holiday, opening night and hal o the wynd) but look forward to trying new tobacco. Most recently I went on a long spree with Hogshead and I am now enjoying the most recent iteration of Eight State Burley which is a bit of a new experience for me.