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“From that perspective, easy access to all previous challenges would break the concept and could render TAC to be yet another guitar tutorial page.”
When I joined TAC, they had a library that had all the lessons available at any time. It never confused me or tempted me to do anything that I thought hindered my learning. It only enhanced the experience and made things more organized (versus “favoriting” every lesson.) I guess the problem is strictly one from a sales and profitability point of view. If they make the whole library of lessons available when you first join, someone could theoretically join for a month and access all the lessons, perhaps finding a way to archive them to use even after they quit paying. I can’t see any other reason for taking away a capability that very much enhanced my learning experience.
I would take the old-old TAC (2017 vintage, before it got reorganized in 2018 into a very forum-rich experience that subsequently got abandoned) in a heartbeat.