"Why did they bother with the original Trek crew in these movies?
Perhaps because it hadn't been done before.
No, TOS movies are NOT the same thing. Honestly, as much as I liked them when I got them there was always a sense of something missing.
To the best of their ability in these times, these films achieve what OS films never could, even in the best of times
, recapture the spirit of TOS.
These are TOS
adventures on the big screen like never before, IMO.