Even so, it's a rather minute difference. As long as the subtitles are easily seen (with respect to size, font, and colors) and are not a big wall of text, reading them is practically effortless for anyone with a high school and above reading level.
Viz didn't start changing things as far as I know until 4Kids started dubbing. For example, as far as I know, Zoro was Zoro in the manga until the dub started. Then they changed it to Zolo.Viz owned the manga didn't they?