Well you're kinda of cramming many patches worth of content into an extended play session, so it's gonna feel a bit lame. At least seeing all of the story at once will help it remain fresher in your memories though. It'll be over before you know it though, and it does drag you through a bunch of dungeons/trials you'd need to unlock anyway so it's not all bad.

On the other hand I think they've been going for much shorter story content in heavensward and some people have been complaining about that. If they decide to bar the next expansion with the condition that a person needs to finish the heavensward story then perhaps a shorter story won't be so bad.