Oh, I agree, and thank you for saying so. There are 3 unmade series that should be remembered, at least in a small way. From the late 60s, HOPESHIP with Dr. M'Benga (
https://memory-alpha.fandom.com/wiki/M'Benga), from the early 70s STARSHIP and STAR TREK: Phase 2 Version ONE (see above).
HOPESHIP was inspired by "Journey to Babel" and gave the opportunity to have lots of aliens. Since HOPESHIP would rarely need new sets; so, the scenic budget could be used for alien make-ups and costumes, thus satisfying NBC's need for new and colorful images. (NBC's parent company, RCA, was the largest producing of color TVs at that time, and STAR TREK was the second most popular NBC series among color TV owners at the time. BONANZA was the first. NBC insisted on new sets each week so that the color TV owners had something new at which to marvel.) Dr. M'Benga would have been the lead, making him not only one of the first prime time leads played by an African American, but probably the African (Ugandan) lead character in prime time.
STAR TREK: Phase 2 Version ONE would have solved a lot of production problems, raised the quality of stories, and would have attracted all of the original cast, with the possible exception of Nimoy, but their is evidence that he would have joined the others for that project. BTW, STAR TREK: Phase 2 was not the title for Version One; it was a production category. Each episode would have been STAR TREK: (new subtitle), much like the recent STAR TREK movies.