Oda likes his long build ups, so I can believe Oda is building up to something with Tashigi and the whole gender thing. It's been the subject of Zoro and her relationship, and before her Zoro and Kuina. My counter to that is that it doesn't really have much meaning when the build up is so ridiculously large as this. We're one chapter short of 800, and Tashigi is still walking around failing at life, her only claims to fame being pointless stuff like deflecting a random cannonball that one time, which any halfway decent putz has been able to do since part 1. Assuming that she finally does get what she wants at the end of chapter 59235, my reaction isn't going to be a realization she was awesome all along. It's going to be a 'fucking finally.'
Let me be clear about one thing: this wouldn't be a problem if there were a bunch of other women kicking ass at their job. Imagine if Trafalgar or Kidd were women, and there were more women sprinkled on throughout the Eleven Supernovas. Imagine some other characters besides Hancock were women in the Shichibukai. Lets have more marines be women than the few that are there. With a bunch of women kicking ass on their own, then Tashigi's failure would only be reflective of herself. But there are very few women who have been show to not only have their own agency and also being strong powers under their own terms. Tashigi isn't a problem because she's a failure. It's because her narrative is, for whatever reason, explicitely centered around exploring women's power, in a series where women typically are under-represented, unempowered, and over sexualized, while also failing at life at every opportunity. As such, it's hard to see Tashigi not being representative of the problem OP has with women, even though she's specifically the character designed to address this stuff.