The game is not the problem its the servers and we all know it. The servers barely managed running base PSO2 without lags (on a full channel) and you expect NGS with a far more demanding system and much more people to run on it ? Dont fool yourself.
I tell you how it is now Sega:" You have only 3 choices." 1.) Buy better Servers. 2.) Revert NGS back so it runs on the old System and Engine again so the old servers can run it. 3.) Wait it out until all the new player dont give a damn about PSO and leave.
Option 3 would be the worse because then you only have the old base PSO2 playerbase and not even all of them because you locked some out with the requirements of the game. So no matter what you do it results into investing/loosing money. Pick your poison.