Hi Sven,
Removing Font Awesome was a tough decision, but I think it was the right decision. The library is massive now, and it never makes sense to load every single icon on your site. Most people only use a handful of icons, so loading all 2000+ icons on every page makes little sense (and goes against the lightweight nature of GP).
Font Awesome also made it very difficult for us when they updated to Font Awesome 5. Backward compatibility was a nightmare, and doing the update would have broken icons on a lot of sites.
I suggest creating your own icon pack using a tool like IcoMoon. That way you only load the icons you need.
Really appreciate your feedback!