I'm also dissapointed, that we won't see calenders in a while. It was mentioned as a "Key Realm Works Feature" in the kickstarter campaign and was very important to me.
I wouldn't say Realm Works is useless without it. But the more you work with it entering dates als text instead of calender entries, the more useless calender entries become. Who would rework the whole realm after this feature will come ... maybe ... sometimes