Ah i see. No, I expect if there will be an open beta it wil be VERY close to launch as a mass stress test. but I doubt that will happen somehow.
And Yes, they need the time to adjust to feedback aswell.
But there is such a thing as too much feedback, as written in my example it is possible the devs chose this route to not be overwhelmed by feedback. maybe. Maybe its something else.
As I already said - if the beta doesnt start now, or at least with the beginning of july, I think it will be wasted.
for 1) the time to implement feedback will be lower and
2) players have much more games to play then. So the actual beta games played count may very well be lower aswell.
but in the end, its their decision