I think it's much more likely that the people on the american side were uncomfortable with the starlight transformation sex change and had no idea how to deal with it.
I don't think that would have even slowed them down for a minute. Optimum (the studio hired by DiC and then Pioneer and then Cloverway) "fixed" a gay couple in S1 by arbitrarily declaring that one of them was female, "fixed" another gay couple in S3 by claiming that they were related so that obvious signs of affection could be handwaved away, and "fixed" a crossdresser in S4 by claiming that he was a she, even though "she" blatantly took her shirt off on camera (Optimum just left that in there, Cartoon Network had to censor it on their end).
It would've been entirely within Optimum's MO to just claim that the Starlights were heterosexual girls, all the time. They simply wear men's suits on stage because they like to look like accountants. It's a Clark Kent disguise.
Cloverway supposedly had the rights to Sailorstars (as did DiC before them, because it was a "TV series" license, not broken up season-by-season), and they along with the Cartoon Network and Pioneer were getting high ratings and selling lots of DVDs and earning a lot of money. It was Optimum's job to take care of these little problems, which BTW were only problems in Optimum's minds (a multimillion-selling
Nintendo game even played the gender-change disguise card a few years earlier).
Optimum was too low on the totem pole to kill Sailorstars. Someone higher than Cloverway had to do it, which basically leaves Toei and/or Naoko Takeuchi, and plenty of theories.
There's this word again, "allegedly".
Well, I put it there for a reason.
The new anime has never claimed that and neither did PGSM iirc.
Speaking about PGSM, that show made Minako a completely different character, turned Luna into a Sailor Soldier, Mercury into a villain and made Serenity mentally unstable and responsible for the destruction of the moon and the earth, it was much more different than the original anime. What vision of Naoko's what that supposed to be in line with?
I think there's a difference between changes made to mix things up and keep things fresh while Naoko is
not in the room, and the ones made while she
is in the room and they're asking her for permission.
From what I remember reading, Naoko always wanted to have a larger role in the workings of the anime (resulting in things like the new S5 opening song), but she was too busy until the manga ended.
Edit:
There's no reason to believe she disliked any changes, in all public statements, in the manga notes, in the artbooks and in interviews she always said that she loves the anime or simply commented on changes. "Naoko hates this and that" is something I've read lots of times, but there's never a source, just fans jumping to conclusions.
I do remember that one of the founders of ADV once "implied" on forums that the reason his "complete season 2 box set" was missing one filler episode was because that specific episode had fallen out of favor with Naoko Takeuchi, but then he clammed up, saying that he was contractually not allowed to say or even imply that was true.