-1. This only matters if a person actually cares about what the Bible says, as in, believes that it is the Word of God, the very same Word that was made flesh, and heeds the warning of the last book of the Bible - where God makes a promise to curse anyone who tampers with his words.

0. KJV is not just one single translation, but includes a few linguistic revisions from 1611 to 1769. Most notably, the u/v swap. The 1769 revision is the most common today. Between revisions, meaning remained unchanged.

1. KJV is based on the traditionally used texts, based on several thousand copies of Hebrew and Greek Bibles, whereas modern translations favor minority text translations - which significantly change meaning of (or completely leave out) certain passages.

2. KJV has been the English standard for over 400 years. It's what our ancestors used.

3. There are other good Bibles, like the Bishops, Geneva, and Tyndale NT, but those do not have the linguistic conveniences of the 1769 and were based on a single copy of the Heb/Greek Bible, instead of the common verse between several thousand.

I don't see a need for a new Bible, when the KJV suits all our needs. The NASB has been lauded as a contender, but IIRC by dropping the thee/thou/ye/etc it makes many interactions confusing about who is talking to who. I think it may have other issues, but I haven't picked it apart as much as I have the ESV/NIV abominations.