Why punish players who just want to play DoL DoH?

[LunaHoshino]

There is nothing wrong with providing a DoH/DoL person a DoH/DoL way of getting to the DoH/DoL content in Heavensward.

Except that would require SE to write a completely separate story for what is a small minority of the player base, which would take time and resources away from other parts of the game.

They have one story, and everyone, old or new, needs to complete that story to access the new areas. It's the most efficient and inclusive way of doing things.