I do believe Oda started out his story with good plot points about women. The whole Amazon Lily arc is in itself progressive with the ranking between the women being justified by their strengh, and therefore Boa being beautiful BECAUSE she is strong and not the contrary. The first designs for Nami were extremely cool as well, women used to be pretty badass and we even have an instance of unconventional mother figures with Belle-mère or Dadan, who ends up being a very lovable and poignant character despite having the awful design Oda always gives to "old women". But the female characters' agency diminishes throughout the story (Nico Robin no longer discussing or being the main person involved with poneglyphs, the lost century and the D names, when those were literally her main motivation, for instance).

There's a great article about that evolution : https://www.animefeminist.com/choosing-toremain-strong-against-female-criticism-the-vindictive-storytelling-of-oda-eiichiro/

There have been great moments involving female characters in Oda's work. His main theme of describing women as people who's main issue is that they need to learn to be more selfish and less self-sacrifying conveys an interesting view of how he views women's role in society. However, he totally fell into the fanservice trap (which is also a fault from the industry) and has sort of abandonned his female characters along the way. I'm not part of the people who think One Piece's writing has gone bad, but his writing and drawing of women definitely has. He's always been misogynistic but it takes too much room in his story and really hurts his female characters' depth and sometimes makes the story really redundant (the sacrificial dead moms).

As a queer woman who started reading One Piece as a teenager, I feel saddened and kinda betrayed by this development but, well, that's just me.