Latest 10.10.4 beta excises troublesome discoveryd code, but why?

[iMore.com]

Apple has rolled back networking code in the latest Yosemite beta to technology used since Jaguar.
On Tuesday Apple released a new beta version of OS X Yosemite. The new 10.10.4 release, build 14E26a, went into the hands of developers and Mac users who are signed up for Apple's AppleSeed public testing program. And it makes an important change to OS X's underlying network technology that may yield improvements for those of us who have been suffering a host of problems for the past several months.

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