Others version bypassing the firewall multiconnector came on cars with rear electric defrosters.
An additional problem with the Chicken Little syndrome is that not all A-bodies used the 1/4" spade terminals for the power feed connections at the firewall. 1963 and 1965 used ring terminals. Even so, we have examples posted here showing they too can get overheated and fail when abused.
Finally, 1975 and 1976 standard A-body wiring splits the power on the engine side of the firewall. '76 uses a shunted ammeter, '75 does not. So even though they use 1/4" spades, the max loads on those circuits are reduced.