I started smoking in the latter half of the 60's, and already, pipesters were focusing on artisan pipes -- especially the Danish freehands that Preben Holm popularized in the U.S. by virtue of his liaisons with Snug Harbor and Lane Ltd.
That was a time when $100 could get you a really fancy pipe, but it was considered obscenely expensive (not to mention somewhat ostentatious -- at least on campus.) So nobody I knew abused those pipes, if they had them. But, everyone had a rack of Medico's, Kaywoodie's and Grabow's, among other "everyman" pipe brands; and in the under $5.00 price bracket, they weren't treated with any particular care (that I recall.)
Absent the internet at that time, tobacco choices were pretty much restricted to what you could find in a drugstore; and for me, a special trip to a downtown B&M, the only alternative, was a fairly rare event. What has changed dramatically since then is the variety and accessibility of wonderful natural tobaccos.
To guarantee a moist, fresh, consistent tobacco product that may sit on the shelf for a long time, drugstore blend manufacturers rely on PG, sorbital, glycerol, poly-phenal-doodle-poop and who knows what else, in addition to artificial flavorings and aromas that improve the wife's acceptance factor. Today's online smokers have many more unadulterated blend choices than even a local B&M could stock back then.
Of course, coming up during those times of limited choice, some of us actually developed a taste for drugstore aromatics; and today even artisan blenders will concede to the demand, couching the practice in euphemisms such as "top-dressed" or "flavored", though I think chemical adulteration, sweeteners, and flavorings are very restricted in modern non-aromatics.
Well, that's my take on how pipe smoking has changed during my time.
(OK, I made up the part about the poly-phenal-doodle-poop.)
ps. In my circle, at least, no one used, or even heard of a pipe nail. Tamping was done with the fingertip. You let the charring light go out completely, you tamped, relit, and smoked long enough to build up some insulating ash. One still developed a callous, and it hurt if you were careless, but that's how we did it. I have long since become a wussy pipe nail user like you young whippersnappers.