There's typically an exclusive emblem for each raid that only unlocks for the player after they carry 10 people to a completion for just this purpose.
Crota's End had "Hope Eater" which was pretty nice looking. And the emblems can only be earned up to a certain time, so it incentivizes collectors to get those newbies in quick.
But yes: I do agree that more incentives would be great. Maybe a yearly gilding of raid titles with 10 carries + a yearly flawless or something to give people a reason to re-run older raids with newer people.
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This doesn't differentiates between full clears or boss cp, you can legit take 10 ppl through a raid start to finish or you can do boss with those same 10 can get the emblems in about an hour. In ops argument he addresses this concern as well, doesn't do much when all you do is carry 10 ppl just thought boss, didn't learn much other then dps.