Aside from not liking the other version very much, I think all if not most of them already have English sub or Machine translation available. It easy to acquire any of those for anyone who want to watch this series.
Whereas older series, forget about it. No one going to bother to subtitle it, becoming a waste as it will never getting seen.
Also because I wanted to re-watch it, this time with a bit more understanding of the story.
As for update. Currently on Milestone 2, part 1 - Eps 35. This eps is bad for subtitle. Too many white clothes and 900+ lines.