They provide a variety of free public services. I doubt the funding allocated for such projects is crazy high, and it likely rides on the backs of a few super talented engineers. Beggars can't be choosers. Were it a paid service then I could better understand your complaints. I'm willing to bet if you reached out to them, inquiring about the lack of any feature, then they would likely explain why it has yet to be implemented.
What's the meaning of this negative commentary? Is HE known to be at the bottom? I have been using their DNS services for a decade and don't think I've ever experienced a problem. In fact I am impressed at what they offer for free.