I think that they need to exist, but I think at this point it needs to official be changed. Racial Weapon feats should be automatic for the race for free. It would not hurt the mechanics and take out the requirement stock. The exception to this is if you take adopted ancestry, your weapon feat changes to that of the "adopted" heritage. You can still take the original weapons group, as you qualify, you just no longer get it free, as adopted changed what you get for free.
With the two new classes from "Imposable Playtest" They have class weapon feats for the two classes. This should be automatic for the class not a feat tax. These New feats are a waste, and should be part of the class, not a feat tax for the class they are part of. They could also be available for other classes , as a flavor for the build, or a replacement for they original feat list for the class. That last part may need more work.
Functionally though the racial/class feat tax is not something that should be kept in the game. This is a rule that gets house ruled away, at least for the racial weapon feats, in all games I have been in, by every gm I have played with.