Woh, why would a distribution drop something as common as grep? Saying you can build it yourself sounds crazy when it always exists and cross-platform...
Maybe they want the core experience to not require ancient command line tools? You don't see many Windows users complaining about the lack of grep.
I don't see many Windows users hanging out in the CLI for extended periods of time, either. Even though OP wasn't serious about fedora nixing grep, surely you see the lack of equivalence in that argument.
When Windows users want to hang out in the CLI they virtualise Linux or use cmder[0].
I would argue that they used cygwin, and now they have the option of using WSL- which I have been using for the last two months, and thus far has met my CLI needs.
Windows subsystem for Linux is what I spend most of my time in now.