Grunt existed when gulp was new, and it had a pretty strong ecosystem. Gulp was an alternate that solved the same problem in a different way, and it got pretty popular. Because of it, the next version of Grunt is totally different and uses ideas from Gulp.
I find it disappointing how some people have such an allergic reaction to others trying something new. If you don't like it, don't use it.
I don't think he's allergic to others trying something new, I think he's just saying that the most important information for them to provide when doing so is "how is my approach different to/better than the existing tools?"
Which is a valid point, IMO. When there already multiple widely-used tools that do X, marketing your new tool as "Does X!!!" isn't very compelling in itself.
I find it disappointing how some people have such an allergic reaction to others trying something new. If you don't like it, don't use it.