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Why is the presumption made that Jesus needed Apostles to help Him found His Church, but He does not need them anymore?

They left their testimony.

21:25 And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written. Amen.

Um, this is a proof-text for the inability of the Bible to be all-inclusive. Stating that there is more that was revealed to the Apostles than what was written down. That this revelation is guarded by the authority of the Church.

I don't know that the Apostles so much ran the Church. Rather, I would say that they established it in the world.

By establishing it they were in charge. They even wrote letters detailing the faith and had them sent to the other assemblies.

Of course they were in charge. So why did this end?

John 21:25 And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written. Amen.

Um, this is a proof-text for the inability of the Bible to be all-inclusive. Stating that there is more that was revealed to the Apostles than what was written down. That this revelation is guarded by the authority of the Church.
John 20:30 And many other signs truly did Jesus in the presence of his disciples, which are not written in this book:

20:31 But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.
What was written is all we need.

By establishing it (the Church) they were in charge. They even wrote letters detailing the faith and had them sent to the other assemblies.

Of course they were in charge. So why did this end?

The Apostles were not in charge.

I know this because JESUS, Himself, said that it would not be so.
Matthew 20:25-27 But Jesus called them unto him, and said, Ye know that the princes of the Gentiles exercise dominion over them, and they that are great exercise authority upon them. But it shall not be so among you: but whosoever will be great among you, let him be your minister; And whosoever will be chief among you, let him be your servant:

Um, this is a proof-text for the inability of the Bible to be all-inclusive.

That is correct.

Stating that there is more that was revealed to the Apostles than what was written down.

No, it doesn't say that. It says "so many other things that Jesus did", not "so many other things that Jesus secretly taught the apostles".

this revelation is guarded by the authority of the Church.

A pretty substantial leap.