As much as Debian's prior policy is laudable it's caused it to have one hand tied behind it's back for the last 20+ years. The result has been distros existing that wouldn't exist otherwise. It turns out as a user I do need those things to work regardless of the manufacturers closed source drivers/firmware, and I want it to JustWork™.
And yes, I know it was already available, but the default installation UX matters a lot.