Like many have said before in the current system you will often run into players that are not prepared for pvp by bringing a character to farm a specific blueprint or faction points etc, their team composition in that case is gonna suck and that's probably what you want.
Yes it is, you're being punished for being greedy deal with it. If you think the developers wouldn't lower your PVE rewards as a result for not being punished you're delusional.
It's very obvious that you dont play as an antag if you think the queue times are just as good or if you think a 4v1 against a team set up to stomp an antag is fair.
You are ignoring every new player who jumps into this game, who gets frustrated being stomped on by 4x level 200+ character over and over again, because they have hero killer for like 50-60% extra damage on their guns and access to WAY better cards than them, the only way a new antag is ever going to win in this scenario is if he gets matched with people not prepared to fight an antag, who are as inexperienced at PVP as him. That would never, NEVER happen if you split the current community into PVP/PVE, there would be no one but hardcore PVP fanatic playing AS the raiders, since they'd get to do the two things they love: Stomp on other people and they'd even get better rewards than if they played the game normally.
I get where you're coming from, and sure it would be a nice safety net if you could just opt out of PVP to garauntee that you'll get a BP drop, but if you give people that opportunity you are killing every future antag, or alternative you're going to have a MASSIVE balance overhaul and redesign of the game.
The current system favors the raiders and if you lose, it is because: You suck at the game (aka he outplayed you AND your 3 teammates), Something unfortunate like a Disconnect or Mentor match happened, or you where greedy and made a shitty, fucking team composition so you got stomped on one of the 3 hallway maps because no one bothered to bring a character that can counter Valeria with the WHIP.
Sign me up even if i hate pvp I'll do it a few times before i get completely stressed out and then go back to pve only.
And there's your problem, because you just removed a HUGE chunk of the population from the pool.
Currently people Antag for two reasons: Because they love PVP or because they want cards/equilibrium bonus.
Queue times are usually around 10 minutes (at least on PC) and that's if you have every map selected. Now lets say you make the rewards good, this will increase the amount of antags who just want the reward. That's gonna increase the wait time, but not to unbearable levels.
But then you remove most of the population they can invade? Yeah those queue times are going to be abysmal, How much of your play time do you think you'd spend in PVP mode?
How much of any newbies time do you think they'd spend in PVP mode?
If that number is anything less than 100%, you're trading your enjoyment for the enjoyment of every antag by making their experience more miserable.
You are the ones trying to fundamentally change the game, so no you dont get to make demands like that.