We see Moffat and the other writers make these very strong female character in a show setting that is focused on a male lead character. That is much harder than writing female characters in a show with zero male lead characters.
But this is the male definition of "strong female character", where as a female character's perceived power increases, so does her sexual objectification in order to "balance it out" and ensure she's still primarily there as a set piece. A true "strong female character" is simply a "strong character", with the "female" part being completely irrelevant to her behavior and treatment.
I mean, think back on the RTD companions. They typically wore trousers, full tops, and not much make-up (except for Rose in a few episodes). No one ever commented on their legs or their ass or otherwise made disparaging comments about their gender unless it was to show that character was a douchebag. The companions never tried to seduce the Doctor or force themselves on him in a suggestive way. They were just people, who happened to be female, and they were able to become accomplished individuals without having to "offset" it with being sexy and seductive.
And then we get to Amy, River, and Clara. Amy is constantly dressed in short skirts, five pounds of make-up, the Doctor nicknames her "The Legs", upskirt jokes are made, she tries to rape the Doctor in her bedroom the day before her wedding, and there are numerous instances of other characters going "huhh huhh, she's hot". River dresses slightly more practically, but she's still the outrageous seductress, makes tons of sexual remarks, and gets nicknamed "Mrs. Robinson" by the Doctor (a G-rated term for "The Slut"). Clara III's behavior is much more respectable, but Oswin and Clara II were still both outrageous flirts, and Clara III still gets "short skirt" comments from time to time. So far Kate Stewart has been the only true "strong" female character in Moffat's run, but unfortunately she was written by Chibnall, not Moffat, and only lasted one episode (though it appears she's returning for the 50th. I just hope that Moffat doesn't feel the need to sexually degrade her as well once he gets ahold of her).
It's like writers are afraid that an accomplished woman comes across as sexually unavailable (which is also apparently a bad thing), so they have to go out of their way to make sure their male audience is assured that, "No, don't worry, this woman may be strong but she'll still totally have sex with you." You see it all the time with female superheroes, warriors, spies, and leaders in the media. "I am super capable, but I must do it SUPER SEXILY, which for some reason my male counterparts don't have to do."
The prevalence of this "strong female = sex object" trope is so bad that it spills over into real life, where you get headline news articles about a female leader's hair or clothing not being visually appealing enough, and completely ignoring the content of her message and accomplishments. Therefore, I have to insist that anyone who writes a female Doctor -- a person who is by definition a leader and inspiration to those around her -- not have a history of falling into the "strong female = sex object" trope, as it demonstrates a very undeveloped imagination regarding the roles and capabilities of female characters. And Moffat has not only fallen into that trope, he's burned the ladder to get out.