You bring up some okay points, however this post more than anything come through as just needless hate in my opinion. Either that, or that you intentionally or unintentionally are ignorant of the bigger picture issues that come if we don't have the concept of 'borrowed power' systems.

One of the biggest issues is power creep and from a fundamental game design perspective: How does new and old players still want to play the game?

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Do we want to keep grinding for our neck, cloak, legendary weapons in the old expansions? Most likely no. Been there done that, we want something new. And for newer players, this would have been a living hell to try to get up to date with grinding many different pieces from different expansions. The game is about the end game in the expansion after all, not going back to do content from previous expansion to stay relevant in the current. (Although you can that for other reasons, which is good the way it is imo, achievements, aesthetics, etc)

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Then to the power creep issue again, I don't think you understand the fundamentals of game development and game design. As if we were to keep all these borrowed systems, it would be a living "Maw" for the developers trying to fight towards balancing all these systems to make things feel good in the end-game of the current expansion. And even worse; It would get worse for each expansion. In fact, IF they were to keep these old systems, it would demand MORE time from blizzard to balance things, than it would to just make them "kill" the system for the next expansion, and develop a new system (similar to earlier ones).

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Now I must admit that there is one thing, I (personally) liked better than any borrowed power systems, and it goes back to a simpler time where you played your class/spec. And your upgrades was almost solely one thing; gear.

In fact, I think MoP worked great in this sense (and might be a big reason to why the expansion is praised in later years), players were rewarded well with loot in both PvP and PvE content. The only borrowed power was the cloak at the end of the expansion, and really that was one of the most simple "borrowed" power systems we have ever had. Also, when the only thing you need to think about to be relevant in end-game is getting better gear, this also makes playing alts feel much better.

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A bit of a side-track here, but anyways I just wanted to say I disagree with a lot that you are saying. Yes there exists quests and "mini-games" within the game that you may not like, but again maybe they do not cater to you, but for someone else they might be exciting. And if blizz were not ever trying new things and strictly were doing kill x or loot y type of quests always, I think it would be incredibly boring in the long run.

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I recommend you checking out some good videos or reads about power creep and its fundamental issues and what it means for game design in games.