Were the objectives of the 3 cancelled Apollo missions ever fulfilled?

No, new missions would not be redundant.

There were legitimate reasons for canceling the last 3 missions. Nixon canceled mission 30 by executive order. After Apollo mission 16 ended more than 2 hours early because if an approaching solar flare, and there was a mire powerful solar flare at the end OG 1972 beginning of 1973. The civilian heads of NASA advised Ford to tell Nixon. The y advised canceling . missions 18 and 19. That is What Nixon did

Congress had funded all three missions, and they were on the launch schedule. Vietnam was escalating. Congress redirected the money to the Defense Department.

All the Saturn 5 rockets have been used That technology is now 70 to 100 years old.

New missions would NOT be redundant.

The truth was that the Government just lost interest

Money has since been spent on projects like Skylab and the Shuttle

Although ill fated, the Shuttle did find out more than all the Moon Missions together

They did find out the Age of the Moon and its apogee and perigee and how it formed from the Theia collision, and put a Golf ball into Orbit and left a car there

There could have been a few tunnels dug and made habitat by the last 3 were done

Now the Chinese have taken over the reins

well, since the missions to the moon were cancelled, but they still already had the hardware, NASA used the capsules and upper stage of a Saturn V to create Skylab. They also used the last Apollo capsule to rendezvous with a Soviet Soyuz 19 capsule

4 counting Apollo 13?

They just didn't happen, that's all. TBH the point of Apollo was to land men on the Moon because JFK said so, that had been done six times, so the only real objective was to collect some more Moon rocks. Not such a great loss.

It's not as though NASA refunded any of the BILLIONS of dollars that they received, whether or not they put on the ridiculous fireworks show of shooting rockets off and away over the ocean, to splash down many miles away beyond the public eye and the cameraman's lens. Sure, they went to the moon 6 times 50 years ago. And nobody has done it since, despite the fact that there was a dozen years between supposedly breaking Earth's gravitational pull and sending a man-made object into space and landing a human being on the surface of the moon. Yet, in 46 years, they've never been able to recreate the feat, nor have they been able to top it. Pilots were flying across the world's oceans within 20 years of heavier than air travel. These people have had three times as many years to wow us, yet they haven't. Why? They keep talking about "going back to the moon" and about "a manned mission to Mars", yet nothing ever comes of it. NASA has never given us anything except cartoons and science fantasy. And anybody who cant see that is either a moron or a shill.

they all were

Nope.

One was used for the Apollo-Soyuz mission, the other two were used as museum pieces.

If, and when the SLS gets sent off to the Moon, those sites may come back into to play, as will the rest of the Moon.

thankfully NASA did not go w/those assignments...............too many people killed by them in other shuttles