Peyton and Billie aren’t even blond tho. The title change still doesn’t make sense, especially because they were promised a lengthy run to legitimize the belts.
This is wrestling, you're not promised anything.
The short of it though is that they wanted to make Bayley a bigger star on Smackdown since they weren't going to have Becky and needed another top female face that would be appealing to Fox once Fox figured out Ronda wasn't going to be around.
It's very clear, imo, that they created a women's tag division because they thought they were supposed to have a women's tag division, not because they wanted one. They didn't want to have to answer questions about not having it. They created the titles and immediately decided someone who they jobbed out and made to look like a geek for 2 years was too important for them.
They could've stuck with it an established teams, but the reality is that they don't want to, and nobody is ever going to get the chance to establish them. I'm sure Sasha and Bayley and Sky Pirates would've fought their asses off if they had a Takeover match or something, but they were never going to be allowed to let them make the titles important, and I'm sure that's a considerable part of the equation as to why Sasha left.