Gunslingers aren't nearly as useful on Crota's End. Is it fair to kick a good player simply because they don't want or like to play as an invisible Bladedancer?
We avoided many wipes on the Vault of Glass because the relic holder had Radiance available whenever the Minotaur on the portal decided to run up the stairs or had a bug.
We found it's much better to have a self-res warlock be the swordbearer on Crota so that no one would die trying to save them in case the team missed the timing, and trigger yet another Oversoul.
Don't impose your playstyle on others. Be respectful. Many good players use Fireborn as a backup, especially on the hard raid or a Nightfall. You may have met terrible players, I also have, but that does [i]not[/i] give you the right to bash anyone.