Uhh, I suggest you to check your facts.
I was complaining about the overuse of the "dragon transforming into a girl" trope. I have nothing to say about the dragon's gender.
And they having dragon forms is meaningless if they're going to pass 80% of their screentime as humanoids. You're a dragon? Stay a dragon!
And in regards of the dragonslaying? It depends.
Were those slain dragons sapients or non-sapients? Were they pacific or violent? Were they actively attacking humans or Were they just reacting to people invading their territory/lair/home? Did they try diplomacy first or they went straight up to breath weapon, claws and fangs?
Now, kindly stop pose yourself as some kind of "paladin for the rights of the dragons" in your puerile search for attention, and let people have their own opinion about stuff.
1. The issue with this trope (and same with dragon boys) comes when a dragon form is abandoned, when a dragon never changes back again and neither authors nor readers even care about it.
When a dragon can change into a human, regardless of its gender, I want it to change back time by time.
A human form is the last thing I care regarding dragons.
Bad example is Beast Master. Tanya, one of main characters, appears as a dragon. Does she changes back. Never. Tanya faces a foe she cannot beat in her human form? Nah, her boobs are more important according to an author.
Iris from The Strongest Sage of the Weakest Crest on other hand, changes back every 6-11 chapters. Moreover, an author, despite of giving her a really badass and brutal dragon form design - constantly shows how hellishly adorable she can be as a dragon, thanks to funny facial expressions and acting weird. He/she certainly wants to raise readers' sympathies to Iris' true form, turning her into a sort of a local Toothless.
However, being the only main cast member to get a figurine (though the main character is Matfhias), it features her human form only. Funko, on other hand, releasing tons of dragon figurines from different franchises, could make one for her.
A good example is Worthless Job: Dragon Tamer (though it has 3 dragon girls), where 80% of screentime is spent by both dragons in dragon forms bevause the main focus is them beating crap out of others.
3 of 4 dragons are girls seems like an attempt to make an impression that dragons are a main character's "wives".
Male dragon face same issue. There is an awesome dragon husbando, Murakan from Swprdsman's Youngest Son. His dragon form looks like a furry bait - it is very muscular and looks kinda anthropomorphic (not exactly since female dragons in these series have the same shape - since it is common to design females in way you cannot determine dragons' gender until they change into humans). Well in fact he rarely changes into a dragon because ... he has a serious heart wound. It will be treated - a dragon is one of main characters after all, but will it really increase his dragon form screentime?
2. It is way more common than in the past decades and gives zero opportunity for dragons to be good characters. Nowadays dragons often get no personality and zero meaning, evil dragons are plain characters with barely any global threat.
And yes, good dragons are not safe from being slain. Being a good dragon won't guarantee it survival.
3. First, we talk in comments about a dragon-friendly manga.
Second, i stand (artistically) for justice for dragon characters. I want my magical creatures getting back that special treatment and the strongest/among the strongest status, like in Yu-Gi-Oh! or Pokemon.
What I see now are tons of series where dragons are nothing but punching bags to be slain just for whatever reason it is. In all sudden, dragons from the most popular magical creatures changed into hated ones.