I know the life support belts were an animation thing but it does seem strange that they've never used or mentioned again.
The Kzinti being from another franchise entirely also probably didn't help with the rights issues which would affect canonicity.
Not to mention the "four wars" against the Kzinti, with the last one being "200 years ago" can't be squared with the Trek canon as we've seen in Enterprise. Even if Sulu was rounding, 150 years before 2269 is 2119. Zefram Cochrane was happily giving a speech at the warp 5 complex with no mention of a Kzinti war just ending.
The Kzinti being from another franchise entirely also probably didn't help with the rights issues which would affect canonicity.
Not to mention the "four wars" against the Kzinti, with the last one being "200 years ago" can't be squared with the Trek canon as we've seen in Enterprise. Even if Sulu was rounding, 150 years before 2269 is 2119. Zefram Cochrane was happily giving a speech at the warp 5 complex with no mention of a Kzinti war just ending.
