It's not quality they're sacrificing. SerenityOS is built on the idea of rejecting anything "not invented here". Basically it's from-scratch on purpose. Ladybir

It's not quality they're sacrificing. SerenityOS is built on the idea of rejecting anything "not invented here". Basically it's from-scratch on purpose. Ladybird by contrast actually has the goal of being a real usable viable independent browser. So they're removing a lot of the home-grown Serenity stuff and replacing with open source libs. For instance they just removed the their home-grown SSL implementation and replaced it with OpenSSL. Likewise with their graphics layer they adopted a mature backend which now supports WebGL as a results. Ladybird's network stack is based on Curl these days I believe. It's about using solid public open source libraries as the foundation instead of having to be experts in every niche part.