I'm not going to discuss this on Twitter because that act alone is not going to help anyone. People who agree may take it too far. People who vehemently disagree will say lots of angry things and this isn't a topic that I think deserves hate or exacerbation from any angle.
Yamato's Vivre Card gives us a pretty clear definition that many people are eithe griefing or grieving and I'm not entirely sure why that is since the card doesn't really change a thing.
Why not? Because it lines up perfectly with how I always assumed Yamato was being portrayed and doesn't change a thing about him while he's pursuing his role as Oden. Here's why.
It's always seemed that Yamato's choice to embody Oden is his driving motivation. Yamato isn't interested in being a man first and Oden second, Yamato wants to be Oden. So muchso that he even acts as Momo's father.
In wanting to embody all that Oden is, that means being a man, a decision that Yamato has zero trouble making. What we have not seen, is Yamato rejecting his female body, simply accepting his role as a male in order to be Oden. Being 'a man' is a means to an end and what's cool is that Yamato has zero problems with that. It's a completely natural and carefree decision.
If someone wishes to reject that or interpret artwork differently, that's well and good, but I'd prepare yourself for what may happen if Yamato finds that he no longer needs to portray Oden. I would venture a guess that if Yamato no longer has a need to be Oden (like say, Oden's son from the past instantly ages 20 years, looks like his dad, and has absorbed his father's travel log) then Yamato may choose to retire that endeavor and forge his own path as himself. At that time, yes, I think it's entirely possible that Yamato may no longer feel like being a male. If that's Yamato being true to Yamato, then I respect that just as much as I currently respect Yamato embodying Oden. I've always felt this to be the case and regardless of what society says, I'll refer to Yamato/Oden as the character wishes to be addressed.
What the vivre card does is suggest that Yamato/Oden doesn't reject his body as it exists, but is embodying a male. To put it simply, if approached about the topic,I'm fairly certain Yamato/Oden would give a strikingly Luffy-like response.
"Who me? I'm Kozuki Oden, the legendary samurai!"
"But he's a male."
"Yeah? So that means I am too!"
"Er..but you're a woman."
"…Yeah? What's your point? I'm Oden!"
So no, this Vivre Card changes nothing in my eyes and as it stands the character still wishes to be Oden so it seems like a no-brainer. If that changes, sure! As always, respecting the nature of the character first.
How about the validity of Vivre Cards? They've been wrong before. Some have been suggesting that amateur columnist Artur said Oda approves all cards. Dunno if Artur said that but as someone whose name is actually on those Vivre Cards that you buy, I can tell you that Oda does not sit there at his desk constructing each card's data. The cards are designed and constructed by an outside promotional company. Yes, as author Oda signs off on them but that doesn't mean he fact checks every card. He doesn't have that kind of time.
However, I'm fairly certain he was consulted on this topic, or his editor was informed of the concept behind Yamato. Oda might not work closely with the cards, but his editor sure does.
So beware who you listen to about their validity.
Tldr; Vivre Cards can be wrong. Oda does not check each one. Yes, Oda was likely consulted Yamato. We have yet to see where Yamato's path will take him.
One Vivre Card doesn't change how the character wishes to be accepted. How that character wishes to be accepted may change in the future.
I'm the odd-one out here I think, but I think it's easy to take this in stride if one simply follows the will of the character. Right now, it's to be an avatar of Oden!