not true, not only only can you learn different chord formations/progessions from these artists that you can incorperate into your own style, but the scales/solo's as well, it gives you a broader spectrum and more of an idea on writing and composing,
IMHO,
and you can do the same by buying the scores from a store or getting them free as part of a guitar magazine, just like they always used to do.
You just don't want to have to pay for it.
If you want to do it for free, learn to play it by ear. That's a much better way to improve your musicianship.