Sometimes you overextend, but sometimes it's just your team that's not pulling its weight in damage pressure and application. Sometimes you play melee and barely have to heal because your own team is literally dominating and putting them all under guard and recuperate spamm all the time. This is how the mode snowballs, and most people don't realize that i'ts literally damage based (and how people position or defend stupidly at times, sure). If those conditions are met, and you're on the wrong side, it's a losing battle unless a miracle or a game turning LB happens.

Now then, I don't especially agree or disagree with you on how recuperate feels, but if you increase HP dramatically and remove recup, you essentially completely negate the utility of barriers (unless you buff them significantly), since their main power actually lies into protecting from instant kills. Now, are insta kills fun? Different story but no, they ain't. But I do think you're putting the finger on something part of a way bigger picture than you're thinking here.