Re: Why did they bother...
If Paramount/Roddenberry shared that belief, The Next Generation and its sequel series would not exist. Yes, the NG ship is another Enterprise, but Picard, et al, were new to audiences.
Different time. There wasn't seven-hundred plus hours of Trek.
"I had no idea you were so... formidable. " - Anan 7 to James T. Kirk, A Taste of Armageddon