And yet some of the worst fighting was at the Bulge, where the M18 ripped the hell out of opposition armor for little loss to their own. Also worth remembering that the M18 (as the T70) fought at the Anzio breakout and came ashore in Normandy at D-Day, though not in the first waves.
Considering that the M18 was there from day one of the major part of American fighting on the ground in Europe and drove all the way to the Elbe... kind of hard to say it wasn’t there for the bulk of the fighting.
“And yet some of the worst fighting was at the Bulge, where the M18 ripped the hell out of opposition armor for little loss to their own.” Perhaps the only major instance where US tank destroyer doctrine — influenced as it was by the rapid German armored break throughs of 1940 — ever had a chance to work (i.e. move rapidly onto the flanks of a German spearhead and ambush it). Mostly US TD’s operated as assault guns because the German tanks were mostly on their back foot after Operation Cobra.