Their initial switch from a pve only game was motivated by data and metrics that showed them it was a better choice to make an extraction shooter (they said themselves somewhere that the game just wasn't fun). I trust they made the right call, so I would say a pve only mode in Arc Raiders would dillute the tension of each round played.
That being said, I'm also very risk averse, so I dislike the pvp part of the game. While I think its a necessary part of the gameplay, and that it brings awesome uncertainty and adrenaline, I think Embark should try and create incentives for more cooperation between players, encourage pvp as a conscious, intended, risky choice rather than a reasonable option when encountering other players.
From Tech Test 2 to the current Server Slam, they've apparently buffed the robots/arc enemies strength, I think that's a step in the right direction, even if I haven't personally noticed a change 🤷♀️