I'll keep this brief for those who don't want to read an essay and will expand on points if needed. Keep in mind that some of the points are obviously personal as well, and further explanation may change some even though I doubt that. Also, right off the bat I want to make it clear this isn't a place to complain "this has ruined One Piece", "it's the end of days", etc. We are all here because OP is still a damn good series and one bad development doesn't change that.
1. It's lazy. Oda couldn't fit the abilities with an existing mythical figure so he created an in-verse Sun God to explain it away so he wouldn't be restricted in doing what he wanted regardless of consistency.
2. It changes one of the best aspects for Luffy. He's gone from using one of the most despised and mundane abilities to the utmost against opponents with superior abilities to secretly having one of the rarest and most special abilities all along but just being unable to use it due to random restrictions that are inconsistent compared to other abilities. None of his rivals or opponents had the names of their fruits changed, even Blackbeard's that supposedly the most "evil" fruit in history.
3. It indicates incredible incompetence on the part of the WG as well. Sure we'll have to wait for some sort of attempt to explain it, but the very fact that it's implied the Gorosei don't know is a big problem in and of itself. You can't seriously handle a problem without even knowing what it is. Having the fruit guarded in the first place also implies that they did know.
4. The seemingly random restrictions placed on the fruit don't make much sense. The fruit is even more special because apparently you can't even do the basic Zoan transformation into your creature that every other Zoan fruit allows unless you specifically awaken it. I've already seen a lot of attempts to excuse this away (like needing haki despite no other fruit having such a random requirement) and none of them really work.
5. There's the meta implication that the race for the One Piece has just been a fool's errand if you didn't eat the right fruit because you couldn't even use it anyway. Roger wanted to meet Joyboy, but to become Joyboy you had to eat Joyboy's fruit.
As it stands, I can't think of any development that has been anywhere close to being as problematic as this one.
1. It's lazy. Oda couldn't fit the abilities with an existing mythical figure so he created an in-verse Sun God to explain it away so he wouldn't be restricted in doing what he wanted regardless of consistency.
2. It changes one of the best aspects for Luffy. He's gone from using one of the most despised and mundane abilities to the utmost against opponents with superior abilities to secretly having one of the rarest and most special abilities all along but just being unable to use it due to random restrictions that are inconsistent compared to other abilities. None of his rivals or opponents had the names of their fruits changed, even Blackbeard's that supposedly the most "evil" fruit in history.
3. It indicates incredible incompetence on the part of the WG as well. Sure we'll have to wait for some sort of attempt to explain it, but the very fact that it's implied the Gorosei don't know is a big problem in and of itself. You can't seriously handle a problem without even knowing what it is. Having the fruit guarded in the first place also implies that they did know.
4. The seemingly random restrictions placed on the fruit don't make much sense. The fruit is even more special because apparently you can't even do the basic Zoan transformation into your creature that every other Zoan fruit allows unless you specifically awaken it. I've already seen a lot of attempts to excuse this away (like needing haki despite no other fruit having such a random requirement) and none of them really work.
5. There's the meta implication that the race for the One Piece has just been a fool's errand if you didn't eat the right fruit because you couldn't even use it anyway. Roger wanted to meet Joyboy, but to become Joyboy you had to eat Joyboy's fruit.
As it stands, I can't think of any development that has been anywhere close to being as problematic as this one.