Requiring users to manage their own root bundle is a recipe for disaster for ordinary users. You shouldn’t need to understand path building to securely initiate a connection with a website.
(Besides, macOS and Windows do let you tweak the trust store from their respective GUIs. There’s nothing stopping you from doing so.)
(Besides, macOS and Windows do let you tweak the trust store from their respective GUIs. There’s nothing stopping you from doing so.)