RN7,
This might feel like I am bashing, but I swear, I'm not...
A couple more fallacies in the last one you put up. In 1940, on the whole, the French Tanks *was* the best out there. True, they did have problems (One man turrets anyone?), but by and large the latest generations (S35 and H35/39 - not to mention the Char B-1) of French tanks was much better than most of what was fielded by the germans. It was German Tactics - and french strategic stupidity - that allowed the Fall of France.
While manpower losses might be accurate for Overlord, the Tank loss numbers you have came from allied sources. Which are massively overstated by almost a factor of 10. I've seen the daily strength reports of the German Units involved in the normandy campaign, and while they did lose a lot of tanks, they never fielded that many in the first place on the western front at any one time. The strongest, and only up to strength, Panzer Unit there was the Panzer Lehr, and they only had 162 Panzers. The various SS Panzer divisions was averaging around a hundred each. The 21st was at a lower number. Replacements sent to the front from June to September amounted roughly 300 Panzers of all types (This doesn't include new units arriving). At peak: 31 August, the total Panzer Strength in the western front topped out at 784. Including those in workshops - which amounted to half of that number. Just taking Panthers alone, only 1130 was sent west before Sep 1, of those, 397 was still on the books as operational, 240 (I don't have the exact number for this handy, want to say it was between 240 and 250) in workshops, with another 124 withdrawn to other fronts.
Panthers accounted for half of all the panzers (including StuG's) on the western front between 6 June and 6 August. Of those present (484 with 1.SS-Pz.Rgt 1, 2, 9, 12; 1.Pz-Rgt 3, and 6, each of 79 (Save for Pz-Rgt6 with 89)) only 131 was wrote off as a total loss. By this time 32 was sent from ordnance depots, and another 73 from Mailly-le-Camp training school upping totals to 458 on hand. Oddly enough, it wasn't till August that Panthers stopped being the bulk of Panzers sent to the west - August to September was when the Panzer Brigades arrived, and they was only 1-3 in panther/other panzer strength.
Part of the accounting issue for German Panzer losses between German Sources and Allied, is that we counted Halftracks as Panzers: Which is stupid, but there you go. And the Lehr's Infantry Regiments was fully equipped to the last man with all the latest armoured halftracks for rides. The only division (Heer or SS) to be so equipped - and they took heavy losses in those rides while serving as fire brigades.
Granted, come november, the strength reports ballooned for the Ardennes offensive, but thats not important to this point.
Copeab is spot on as to why the Sherman was under gunned. It was never meant to take on tanks in the first place: it was supposed to be an Infantry Support Tank.