OMISSIONS or ADDITIONS?: Why Are Thousands of Variant Readings Missing from the Modern Bible Translations?

WHY IS IT THAT OMISSIONS AS OPPOSED TO ADDITIONS SEEM TO DISTINGUISH THE WH NU TEXTS FROM THE TEXTUS RECEPTUS (RECEIVED TEXT)?

Why is it that we have what the KJVOists & TROists call omissions in the Wescott & Hort 1881 Greek New Testament (WH) and the Nestle-Aland 28th edition Greek New Testament (NA), 99.5% same), which the WH NA would argue are actually additions to the original texts.

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