The difficulty curve in the game has... problems...

[Colt47]

If you have played the game long enough, then you would see the difficulty curve as you name it to be that it has gotten much easier to play this game during the last 2 expansion, even Savage/EX difficulty is in decline by the extremes.

You don't need third party tools to play this game.

That's going to go off in a completely different direction, but difficulty is always and shall forever be subjective. If I played a game for a long time than obviously things will be easier for me, and if I played the game during HW and compare the now to then, I would likewise have the perspective that the difficulty decreased. However, if someone came in later, like in shadowbringers, than the game difficulty has been relatively static as well as what the curve is. Also it seems like you don't understand the problem being pointed out...