As Apple's Bonjour page points out, addressing and naming is only 2/3 of it. If that's all you support, then you still depend on users knowing the name, and typing it with no mistakes -- not exactly "zero configuration". 1980's AppleTalk was better than that.

How do browsers 'support mDNS for name resolution'? Isn't that a feature of the OS? I can "ping NAS.local" (without a DNS server) just as easily as I can go to "http://NAS.local", and ping.c doesn't appear to have any mDNS code.