They didn't change their minds, they're fixing Fuller's mistakes. He's the one who wanted them naturally bald.They've since changed their minds and are in retcon mode.
Clearly they're not with what Season 2 has shown us so far.They're doing their own thing.
And the producers immediately regretted it afterwards. David Goodman even wanted to use it again in Season 2, but Rick Berman said no.They had another model but made the choice to reuse the D7/K'tinga. Therefore, it's canon.