...yes, if you're driving a road race or gymkhana or something similar, but for normal "street" use there's enough "air" coming around on the back-side to keep temperatures from reaching the "...melting metal..." level.
...just think about all those "gawdy" snap-on full-wheel hubcabs of the 1960's & 70's...and back then most brakes were DRUM not DISC.
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