Third person with low tick rate servers is going to be extremely tough to keep the hard core pvp'rs long term and frankly that might be the best for Arc Raiders. If you have seen the video of Shroud killing a group of 3 from the perspective of Shroud and then the people he killed you can see a lot of the short comings of the code. He can peek shoot them using 3d person before the movement even registers on their end. I've actually experienced something similar to this in a fight where a guy would peak shoot me and I'd be hit before I saw him. Honestly, I thought I was just bad (cause I am) but seeing that video makes me curious.
Still, your hard core pure pvp murder hobo leaving back to Tarkov might be a blessing if the game can keep the more balanced player. As it is, the mechanics of the game are super exploitable. You can camp spawn points apparently, as people are logging in to getting shot. Camping extractions makes it extremely difficult to exfil without killing the camper, pressing the button locks you down and takes long enough that its rather easy to interrupt. Those things will end up choking the game if not dealt with. Add on trying to fight a boss in a pvp zone and people will quit in frustration.
Its good to hear they have a bunch of content being datamined and that its possibly available for release. A consistent release schedule for stuff to keep the game feeling fresh, ala Helldivers warbond/story arc bullshit will really help the game maintain a player base. So will adding a 'boss fight' pve area. I know the pvp'rs will weep and gnash their teeth about it but imo its the only viable way to do it. IF you want, you can make the zone outside of the boss fight a pvp buffer to the exfils, but fighting a boss with actual mechanics while being murdered is too much.
I saw their initial announcement trailer and a part of me wishes that had worked more to make the 'interesting pve' aspect of that game. The mobility of jumping around with some kind of limited jump pack combined with the use of grappling hooks to climb on and entangle the big ARCs ala Jack the Giant slayer looked interesting and would help define this game from 'just another extraction shooter'. I'd have been interested to see what their original build looked and played like and perhaps they can add aspects of that back in to help set this game apart.