I'd ask how you arrived at "60%" but... Don't really wanna hear the crud behind that made up number.
In CtR dying will put you in a position to help defend your own relic. IF it's even under attack and IF you get a short respawn. I've literally never heard of anyone dying on purpose to do so nor have I EVER heard of someone killing someone else 2 seconds slower, on purpose, to give them a longer respawn. It's not a thing in this game and that's largely because there is no need to gib.
In Chaosball there's no telling where the action might be and so how long it takes you to get back after death is highly randomized and only reliably dependant on which team has it. If it's your team, holding the ball in your spawn, then that's nice. It's still not as good as not having died though.
In the two flag games it really depends on which flags are available and when.
This is a silly topic with 0 substance. That being said... I am not opposed to having a mandatory and unalterable 10 second respawn. But, for me, that's because I feel like I get 19 as often as I get 1, and I just really don't like getting 19. But trying to skew it as being advantageous is wrong. Sometimes it is... Sometimes it isn't... Almost impossible to control... Not worth talking about.