Replace instead of quitting

In my opinion this game realy lacks an option to replace players in abyss content. It is so annoying that you have to join 15 different groups because every group have at least 1-2 people that refuse to play since the setup is not perfect or someone have not yet min-maxed everything before they even try the fight.
If you as single player could leave a raid and get replaced the experience in pug/matchmaking would be so much better.
Simular you can be kept in a group you want to leave due to having to go for whatever reason - if enoth vote no you are just stuck and subject to a report for afk even though you might have been there for 1-2 hours trying to kill a boss.