So-called “borrowed power” is a good thing. It allows each expansion to be fresh, as opposed to stale unchanging classes or five hundred abilities apiece.
So-called “borrowed power” isn’t the problem. It’s the burdensome and unnecessary time gates and restrictions that come with them. Give us our new toys, which should be complete by the time we hit max level, then let us go for our tier set bonuses based on whatever content we enjoy. Simple and allows easy use of alts.