I believe this would be the same reason we don't use mechanical instruments, incense, animal sacrifices, etc. Merely because these were used in the Old Testament worship, doesn't authorized them for use in worship under the covenant in which we live now. Again I believe it's a matter of teaching the authority of the scriptures and thus saith the Lord.

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In Christ,
brother Sonnie

Jeremiah 6:16 Thus says the LORD: "Stand in the ways and see, And ask for the old paths, where the good way is, And walk in it; Then you will find rest for your souls. But they said, 'We will not walk in it.'