I appreciate that you don't agree with my statements. All I can do, though, is stand by them.
And, perhaps, add that McFadden was definitely out of STAR TREK against her will, whereas Lenny had all the control over his future in the franchise. So, her return was actually more meaningful, in a lot of ways, than Nimoy's battle for use and control over his image and all that. Plus, I believe he felt he'd been owed some monies as well. But his participation in STAR TREK was always up to him. Bev is not the iconic Pop Culture Icon Spock is, no. But her place in TNG was just as important as Spock's was in TOS. The CMO role was McFadden's gig.
The particulars of Diane's involvement in the show were not going to permit her character to replace Bev. Everyone knows the cast was mostly unappreciative of her situation and some even had issue with her - namely Sir Patrick Stewart. So, whilst it's nice to kind of play it out, for some fans, what TNG would've been like with a permanent Pulaski, it had no chance, anyway. Someone new would've had to try for the part of the "D's" new CMO, after Diane left, because Pulaski wasn't it. And only because so much time went by, in that instance, would the cast be able to warm up to TNG without Gates.
But if there was any chance of enticing her back it was always her gig ... not Diane's ... not anybody's. Just like replacing Spock after TWoK with Saavik wouldn't have cut it. Gates was part of the team that proved there was life for STAR TREK after TOS. Some bands can drop members, add members and nobody takes notice. Others, though ... it's the original members who make The Magic work. Or the chemistry ain't right.