What you say about the pre 7.0 drg is only a taste thing.
Its the correct way of square, to let us use dragon soul from the start now.
Because, every (or nearly all) classes was able to start with a full burst at the start of the battle. Only the drg was not able to use its burst at the start. He was even off-time to anyone else. Or, had to hold back and used a non-logical rotation (logical way, the game teached you was "high jump -> mirage dive -> Geirskogul, after 2 times did you started the dragon soul, but, all buffs runned out at that time, you needed to start with Geirs, than the jump and had to wait around a minute or 2, to go into burst). The dragon eye was even a pain, with selecting a target as a Partner mid-fight.

To change it to the Instant start was the correct way.
The only things i would change is, to use a other Button to start the burst mode. I want allways to use geirs, but not want to start the burst each time.
Maybe, they should changed the dragon eye skill to the kind of skill, that gives you the needed ressources at ones or start the Mode without the ressources.

Its true, that they could do it in other ways. But in overall is it ok, with what they are doing (maybe set Nastrond to a 2 charger). Let them test this for now. Whe saw with Star Cross, that they listen sometimes to the people.