Because they aren't official figures - I could have ordered the faces and hairs online and made them myself. There is no point including them if they have made zero effort to make them look like them - I would rather they didn't exist. And the creators really need to evaluate their morals and work ethic if they are proud to put them out, and to have the nerve to charge people (esp. children) for them.
Honestly, I hope social justice warriors jump on Lego for giving Krum that hair when it doesn't fit his ethnicity so they have to change it.
because it's lazy and they look like trash