It is well established that Polymorph is broken. However, I often see the claim that "WotC gave up fixing Polymorph." Is there any kind of story in this? From what I've gathered, it seems they must have gone through multiple mistakes before giving up completely, but I don't think I've seen any evidence of this. The only thing I know for sure is that Shapechange received a strong nerf between 3.0 and 3.5e and that there are some dead links that are supposedly posts on the WotC blog about Polymorph.
To be explicit, I am asking for the Polymorph story between its printing in the 3.0 PHB at the end of 3.5e and I hope this story explains where and why "WotC stopped fixing Polymorph." I suspect that the other spells at Polymorph will appear in this story, but other than making fun of the original Shapechange, I don't think they are necessary.