Looting with no risk gets super boring super fast; unless they provide some steep incentives for NOT queueing up in PvE only, this game is going to fall flat on its face.
This is a fascinating take. You feel adding an optional extra mode will make the game fail? Not adding it will allow it to succeed?
The goal is increasing the user base, right? I'm someone who never plays PvP. I'll never play Arc Raiders without a full PvE option. You seem to be full in PvP. You're already playing. If they add this mode, I'll likely buy it and play the PvE maps. I suppose the question is, will you stop playing PvP?
Concerning your statement about risk, it's completely your opinion. I find games like Power Washing Simulator incredibly boring, but they're successful enough to inspire sequels and clones. The solution is simple: I don't play them. If someone finds PvE boring, they can elect to never play. I find plenty of challenge in other PvE games like Helldivers 2, Deep Rock Galactic, Borderlands, and a myriad of other dedicated co-op (no PvP or "versus" mode) games. So for someone to say "I don't like this mode so I don't think it should be there" is a nonsensical response to me.