The problem isn't the lack of a configuration option, it's when the default is to ignore the one configured in the operating system. Suppose I have all my devi

The problem isn't the lack of a configuration option, it's when the default is to ignore the one configured in the operating system. Suppose I have all my devices configured to use my local DNS where I've added names for my other local devices or changed the ones for some names because local devices should use the RFC1918 addresses instead of the internet ones that are routed differently. Suddenly Firefox on every device is using Cloudflare even though nobody ever told it to, and now I have to go touch every device and fix it, including when they're BYOD and the owners want them to "just work" and resolve the names correctly without me having to touch them. Then the same thing all over again when Chrome does it or any other application.