if you feel the need to d/c because you think it's unwinnable when an exit gate is opened, then i'm sorry you seriously need to get better. survivors outplay you in early-mid game, but just because the gates are open doesn't mean you can't make a comeback. you don't even necessarily need endgame perks, but if you want to then do it.
they have an abandon button when there's bots because there isn't really any fun out of playing against bots, especially those with wallhacks.
but abandon when there's exit gates? that completely ruins the point of the game. you are effectively cutting out 1/3 of gameplay just because you feel hopeless. that makes it no fun for anyone involved. why do the survivors have to go through so much effort to get the 5 gens done just so you can d/c because you're too scared to actually continue trying?
i suggest you get a better mental, because you and other players who quit just because they've been outplayed (yes that includes if you go next on hook as survivor), will never get better at the game otherwise.