The premise of Voyager was subverted into a simple adventure-of-the-week. Originally they had wanted to have it accumulate damage and have patches/retrofits as the seasons progressed- it even had a spare warp core which was totally ignored in the couple of episodes where it would have proven useful.
Problem was the suits wanted the shows to stand alone- if shown as syndicated reruns they would be almost interchangeable. Trek shows typically lasted seven seasons because that was the optimum balance between the investment in the show and maxing the payback with syndication (Enterprise was the only exception).
'The Year of Hell' was the only story where the original concepts were realized although limited to a two parter you could see what the result of battles on the hull was like and it is my favorite for that reason.