With age I’ve really pivoted on when to zipper merge. It used to be”merge early to be polite”, but now I’m firmly in the camp of “If everyone merges at the end, then it is perfectly equitable to everyone.”
It’s the people who merge early who cause the unnecessary disparity. At least, when one lane is ending this is true.
The “I” in DEI is literally “Inclusion”. Nothing more divisive than inclusion, surely.