This is a good choice. This set caught my attention when I was looking at which icon sets were available for Discourse. It’s refined and elegant.
The complete lack of filled-in icons was causing a few issues, for example the unread indicator was barely visible as a colored circle, or the dark/light button switch would be difficult to render properly without a filled-in part.
I notice you solved those issues on the meta branded theme. Did you add custom icons for this?
The Discourse logo on the top left isn’t clickable on the meta branded theme, by the way (it has been the case for months I believe) 