I agree that bringing 31's in the hard raid is fine up to Crota. But even with a full team of 32's and maxed raid weapons (hive disruptor)/ Ghorn, crota is VERY hard now. If you get in a group you'll see for yourself. All the guys you crushed in the crota encounter are now yellow bar majors. That sword knight that jumped onto the bridge on normal is now a yellow bar ascendent wizard. There is no chalice so you NEED to have ways to self heal. And the encounter ends with a burn phase where crota summons an oversoul, boomer knights, a wizard, ogres, thrall, and acolytes and you need to survive it all and kill him in maybe 10 seconds or you instantly die. But make no mistake. You doing 40% less damage and taking 40% more, will be a factor.