Anyway, I think Joanna's muay/kickboxing background is what allowed to sink so smoothly into mma, whereas it would be harder for a thai or thai styled striker to go straight to mma. Joanna's footwork was already very active and movey (idk how to explain it) and she used her hands a lot too.
If you look at Joanna's trainers you can see why her clinch game is lacking and why she has more of kickboxing style. Though I've seen her in some fights which between a thai and kickboxing stance.
Few western fighters know truly how to clinch and female fighters even less so. Caley Reece is a big exception in that she trained clinch heavily for a long time,probably under the influence of her fighter husband despite not being in Thailand often.
I agree that from what little we've seen what sets Joanna's Muay Thai apart is that she is not just a strait-ahead fighter. Many female Muay Thai fighters, and male too, are used to their opponent standing right in front of them, and struggle when their opponent isn't just moving forward and back. It's kind of crazy that Randamie did not have quick success in MMA. People talk a lot about fear of the takedown. But I think it is much more about the dimension they are used to moving in. She's also really comfortable in space keeping her opponent at the end of punches. She does not hit air a lot, the punch that lands 3 inches short.
That being said, Joanna was undynamic against Duannapa. A lot of it is how your opponent makes you look. Even fighting someone bigger than you, and someone smaller than you can produce really different fights. You are never as bad as you look when you lose, or as good as you look when you win.
I also think there is a big difference between westerners who fight in a "Thai" style, and Thais that fight in a Thai style.