I agree with pretty much all of this. Of course, that goes back to my basic theory that the actors in a production should never be given creative control. I'm not saying actors can't make good directors. They certainly can -- just look at Jonathan Frakes. But more often than not, if they start directing the things they appear in, or becoming the executive producer, or whatever, they "lose the plot" as folks like to say. Witness Patrick Stewart and Picard (the series).
What amazes me about TFF is that everyone let Shatner just do what he wanted. Where was Harve Bennett in all that? Back in TSFS, Shatner had wanted to get involved in the scene between McCoy and the unconscious Spock, and Bennett vetoed it, telling him that was DeForest Kelley's moment to shine. Why didn't he take a similar stand on TFF? And why didn't Harve Bennett, the budget-minded TV producer who managed to pull of TWOK on a shoestring budget, tell Shatner that he couldn't indulge in hanging off the side of a mountain in Yosemite when they didn't even have enough money for their visual effects? It's baffling to me.
If it weren't for Nimoy and Kelley themselves at least offering a little resistance, we'd have had Spock and McCoy betray Kirk too.
Fortunately, back in the TOS days, the dynamic was different and the actors didn't have that much control. Can you imagine Shatner today ever agreeing to an episode like "The Tholian Web" where Kirk just floats around a parallel universe for most of the episode and Spock and McCoy get to be the stars?