As a disclaimer, I'll point out I haven't done savage Alexander yet. That being said, here's my take on new content.

It should be possible to beat by skilled players when it's added to the game. Doesn't matter if the skill required is particularly high, just that it's at least possible.

That means that any gear requirements need to be designed with current best in mind, not several months down the line when we're all packing level 250 god-tier equipment. If it cannot be currently beaten, then there's literally no point to it even being in the game. It's effectively 'not ready' for the players.