They have a PA-specific event that happens every year ("Black Desert Festa") at the beginning of December, they're probably going to talk about BDO more at that point. If they tried to stuff BDO into G-STAR too there wouldn't have been enough time to do anything, and if they tried to do all of this at Festa then it would have overshadowed all of the BDO content because describing it all would take so long. (And don't forget that G-STAR is sort of like Korea's E3. It's a trade show a bunch of companies show up at, not something purely run by PA.) In my opinion, it was probably the best decision they could've made to have BDO have its own separate stream. That being said we don't really know that they won't bring up these other games at Festa, but given that it's been called "Black Desert Festa" in the past it'll probably be primarily about BDO.