As I understand it, these were built as assault tanks for the specific purpose of supporting the Normandy invasion. The additional weight, wear and tear, meant they weren't expected to last.
Front mounted ancillaries probably wouldn't have lasted long in it's role in the push, and wouldn't have been replaced as the tank itself would have been expected to be replaced beyond the break-out.
I've no documentary evidence for that, but it seems to make sense to me that they'd not add them.
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