Oh, I now see why I was not following you. I don't think the "Default" name to be a problem, quite to the contrary. What I don't like is the inability to select the other (the non-default) theme. Even if you renamed Default to Yaru, that won't make Adwaita appear. And if in a vanilla session you renamed Default to Adwaita, that won't make Yaru appear either. The only way for a shell theme to appear in Tweaks with a name that is not "Default" is to be listed under /usr/share/themes/<Theme>/gnome-shell (OTOH, to be "Default" it has to live under /usr/share/gnome-shell/theme).
What I did point out is that by linking "the other theme" from /usr/share/themes you would get two entries for the same theme, the Default one and the Yaru/Adwaita one. Now, if you wanted to remove Default and at the same time introduce Yaru and Adwaita, I think that would be more difficult to achieve that my simple fix. But, in any case, now the description is not accurate to me :)
Oh, I now see why I was not following you. I don't think the "Default" name to be a problem, quite to the contrary. What I don't like is the inability to select the other (the non-default) theme. Even if you renamed Default to Yaru, that won't make Adwaita appear. And if in a vanilla session you renamed Default to Adwaita, that won't make Yaru appear either. The only way for a shell theme to appear in Tweaks with a name that is not "Default" is to be listed under /usr/share/ themes/ <Theme> /gnome- shell (OTOH, to be "Default" it has to live under /usr/share/ gnome-shell/ theme).
What I did point out is that by linking "the other theme" from /usr/share/themes you would get two entries for the same theme, the Default one and the Yaru/Adwaita one. Now, if you wanted to remove Default and at the same time introduce Yaru and Adwaita, I think that would be more difficult to achieve that my simple fix. But, in any case, now the description is not accurate to me :)