In my opinion, the biggest argument against this change is that it further convolutes an already convoluted new player experience. New players don't have the opportunity that veterans did by having the systems introduced patch by patch.

There isn't a flow of progression. It's just "Hey, here is a big tangled mess of stuff. Untangle it and figure out how it all works together. Good luck."

When the initial learning curve is too steep it will ultimately end up turning a lot of new players away from the game. Black Desert Online is another example of this happening. It's a good game but between learning the combat system, node system, professions, and many other systems it requires a ridiculous amount of googling to get over that hump.