I agree. Honestly, when I enter a match that's an onslaught, I just quit immediatily. In the opposite side, when you're suffering a sound beating, people quit, newcomers quit (like I do) and you're not only stuck with a better enemy team, but also ends up with a numerical disavantage.
I normally quit in team MP games where the match became an onslaught. People may disagree with this attitude, but I buy games to have fun, not to be stuck not having fun during a massacre. In one-on-one games I remain until the end. An option to surrender would solve most scenarios anyway.
Just today I was playing a few matches of BF1, then after a few mtahces my entire team either caught the stupid for one entire match or they were completely replaced with new players, because my team was getting backhanded left and right. No matter what I was trying to do I would get flanked by 3-4 enemy players while mine were running around like headless chickens. In that situation there was nothing to be done, no turning things around since we were losing the match rather quickly, I decided at that point to call it quits before the match ended.
I know very well that there are those cock sure strong willed folk who believe anything can be turned around on a dime, but when you've got a team full of idiots vs a team full of skilled players, the math and facts speak for themselves. That is unless you're playing a game where your entire team can be braindead and you can somehow become godlike and carry your entire team to victory.
People will disagree but at the end of the day it's a video game, a luxury product and they cannot force you to play with them (though these days it seems anyone who remotely thinks of quitting a game is to be atomized on the spot, which I don't think solves the issue entirely). I too buy games to have fun, if anything as I get older I find myself wanting to keep the level of fun as high as possible, but the competitive nature in gaming seems to seep into almost any game with a hint of PVP.
I honestly cannot fathom why we have said option irl, yet in video games it's frowned upon. I'm well aware of sportsmanship and all that, but you are allowed tom throw in the towel, you see it happening in Wrestling and other sports for example, war etc. It shouldn't be denied as an option when it comes to video games.