Howdy Mark! So you raise a point that a lot of people I have showed the game to IRL asked too. @Draven is very much correct! Its greatly about support and server loads. So think about like Onward, Raw Data, VR Dungeon Knight, etc. They all look very good in VR and have a online function. So why can't Orbus right?
The Amount of Players
As Riley stated here:
Our ideal goal is to have a server structure that can handle 200 players on the same 'shard' so that this really isn't an issue. (We're planning to support around 1,000 concurrent players per server so the chances of 200 out of 1,000 people being in the same zone is probably pretty small). Right now we can handle about half that, or 100 players per shard.
So with that in mind, supporting that many players in an environment that looked as good as some of the other VR games on the market would eventually take quite a hefty server especially with community growth after Early Access and full launch. Most of the games mentioned above (Onward, Raw Data, VR Dungeon Knight) cap out at 10 players.
ORBUS IS FREAKING HUGE! Well, its going to be. Even now it is large enough to get lost in and some locations can take about 30+mins to get to. Right now there is only one "section" of orbus playable. There are four more coming, of equal size (that I know of). 80-90% of it is completely explorable, AND WITH NO LOAD SCREENS!
(Unless you enter an instance IE: your house or a dungeon)
And I think it's going to be even bigger, so they may have to have load screens later. I was shocked with it's current size and lack of loading. Most games do not have this scale of a map, and especially not the playable space that this one does.
As stated here by Riley:
My development rig is a beast, but I have a Vive testing rig set up that is lower-end, it only has a Radeon 290 which is the minimum recommended card for Vive usage in general, and it can run the game so far no problem. One of the nice things about the art style we are using is that it isn't very demanding.
They are aiming the specifications and testing the game on a low-end rig so that they can have anyone "VR ready" play. Which I have to say I really love. Sure they could ramp up the graphics, charge more for the game, maybe even add a subscription and make it match the "high-end" of VR right now. I don't know about you, but I wouldn't want have to upgrade my rig to some bleeding edge graphics card and processor to play it and catch fire mid raid. If you ask me, this part alone is enough to buy the game.
The community is great, the devs are down to earth and very helpful and people genuinely love this game. It's a breath taking experiences the first time you login, rag-tag a party and make friends or go fight a world boss. That my friend, can't be generated even by the most powerful graphics card.
Please check out some of the awesome fun people had here in the Orbus Beta Safari.
I hope that helps answer some of your questions man. I really hope you decide to join the fun. Because trust me, it's a lot of fun.