"New game plus - quests will have no rewards..."

[linay]

I get it it's an mmorpg but, it would've been more valuable if our choices mattered and NG+ allowed us to explore different choices.

Being able to explore different choices on the same character actually makes choice irrelevant. For choice to matter, you should be limited to explore only the consequence of your choice. Create a different character if you want to explore another choice.

That said, choice also only matters if it can lead to a different ending. An MMORPG that relies on story continuation rather than multiple endings is not a good fit as it will just complicate the story if you need to account for each choice.

A good example is SWTOR as the choices in that game become largely irrelevant the further you progress through the story. In fact, there seems to be a bug where certain choices reset to default values. And if you create a boosted character, there is only a predetermined set of choices that character could've taken.