you can solo the DZ just fine, if you get a really good item just change characters and wait until off hours to extract (or until friends come online). it won't disappear from your inventory, you just can't use it until you extract. All we see is level 1-10 of DZ so its really hard to tell how the end zones will play out. When gank wars do start out in the DZ though it becomes just a massive clusterfuck, remember once you go rogue 5 everyone sees you on their map and you become hunted super fast, and anyone can shoot at you without going rogue (at any level of rogue). Its going to be more common for people to bait-rogue: if you shoot someone just once or twice, you won't go rogue (need to do 15% dmg to them), but if they shoot you back THEY go rogue and now everyone can attack them.
The game releases in 5 weeks, not much is gonna change at this point especially big stuff like locking borderless windowed mode to 60 fps on PC. Still with g-Sync thats not a big deal, with a 970 and everything set to max I was hitting 40-45 most of the time @ 1440p, hitting 90+ seems like it'd require pascal. I was still at 144 hz g-sync mode even in borderless.