If i'm misinterpretting what you're saying, please correct me.
As as it is group exp is halve; I, as a rating 22 paired witha rating 21 got 330~ ish exp fighting a mob. That same mob, when i fought it without that other present at the same rating, i got 650~ exp.
That exp sap is what i want abolished - i don't want to level that character with others anymore...alongside the trophy and money (from)/loot splits groups already suffer, now we have an exp split too...that's too much for me personally, i don't have any incentive to group level anymore - i'll take the higher difficulty to cut this god awful grind.
I totally agree with you, though, people not contributing shouldn't get too much exp, and i disagree with powerleveling for the most part.