If I'm not mistaken, this is the first FSE theme that has a sidebar. At least, I've been obsessively comparing them all and haven't found another with a sidebar yet. The vast majority are one-column themes, with a mobile-suited layout (you know, the really big text, flat design, and all one column). They start to look all the same.

I'm still getting used to the full-site editor and definitely do not feel comfortable as of yet adding a sidebar to an existing theme, so this one is a gem for that reason as well.