In addition to the problems with Moon-bounce that others have laid out, you have another biggie.

During the coast to (or from) the Moon, the Apollo stack was not lined up with the Moon. The antennas tracking the mission had to aim for where the spacecraft was, not at the Moon.

Since the some of the dish antennas had directional accuracy on the order of a fraction of a degree, you couldn't just "point the antenna at the Moon" and expect to pick up the signals during the entire mission.

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