Yep this is why I'm dumping my Android phone. I've got a Samsung and the options on it are only mildly better. My HTC is basically a telemarketing frisbee with no call-block function with any apps since update 4.4 to 5.0 removed the core ability from the operating system.
Its just sad the way Google/Kitkat 4.4 team decided to remove a lot of app compatibility for call handling (bare in mind, Android phone has always relied on either the manufacturer 2nd party software, or 3rd party apps to control calls and text messaging)
I think we all know why Android lost almost all of its meaningful call-handling options 3 years ago. If you don't believe in this particular conspiracy you are a moran. But if there is an Android version beyond 5.0 that restored everything the pre 4.4 had, please aware me before I throw these phones in the trash.
I have 3 phones total, yet no Iphone. Time to change that.