Because if you load from the back, passengers in the rear of the plane often will put their carry-on luggage in overhead bins further forward in the plane. This is so they can grab them as they walk by on the way out of the plane rather than wait for the passengers around them to get their bags. The end result of this, however, is that overhead bin space is then filled before the passengers seated further forward in economy board the plane, leaving nowhere for them to put their carry-on luggage.
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