To each there own. But if every pipeful is not an adventure to me, whether blended by someone else or me then why bother smoking it? I alter most everything. That is to say, I do most things myself if at all possible and buy it prefab/premade when I have to.
Just because I buy a blend I like does not mean I can't like it better. Or that I can't make it better to my liking. I seldom tell myself someone else can do a job better than me! And I will try my best to prove me right even if I fail in the attempt. I've hired contractors who had been doing their craft for 30 years--- and were terrible! I remember one concrete guy been pouring cement all of his life. His work was a disaster. Just because you've done something longer or more often does not mean you are better at it.
Have you never redecorated a room? Never altered a dish? Gone to a restaurant and had a meal you loved? What did you do, keep going back there for more or go home and learn to make it yourself even more to your liking?
I've modified most every car I've owned, rebuilt the engines, added horsepower, put in better sound, tightened the suspension. Or you can go to a mechanic and pay him 4-6X the cost!
To each their own, but I cannot understand someone not even trying to blend here and there. Don't you tire of a blend? What about when you get down near the bottom? Like a food where I add salt or pepper to improve the seasoning, I often smoke a blend and find I might like it better or wonder how it might be if it was sweeter or a bit spicier, etc. Curiosity is the engine of creation! If for no other reason so that if a favorite blend becomes unavailable, rather than fret, I might have an idea how to go about making something similar myself!
Lane or Gawith might have blended tobacco much more and far longer, but if they make a blend I love, it is an ACCIDENT! They have no idea what I like. But if I make a blend myself, no one knows better what tastes good to me better than myself, and whether basic tobacco or pre-existing blends, they are all coming from the same basic constituents. If you blend it yourself, FOR yourself, you are bound to love it because no one knows your tastes better than you.