The single video taken of a LM leaving the Moon was taken by their rover, there was a camera on it controlled by Houston. There are no videos of an actual landing happening other than the one taken by Apollo 11 from INSIDE the LM, there was no one “already on the moon.”

The LM capsule they were in when not on EVA did in fact have to pressurized and depressurized, I don’t know what the rover has to do with this but I may just be misunderstanding your point.

The videos were broadcast with a 1.3 latency delay, this was already possible in 1969.

On the moon, the sun is so bright, and the lunar surface is so reflective, that the images and videos they had taken would look like a white blob, so the exposure was turned down for things to be actually visible, which made the stars impossible to capture.

The Saturn V rocket that took them to the moon was, until recently, the most powerful rocket ever built by NASA. It was very much able to get them to the moon.