You're right. They are clueless and don't get the message. The situation, as I see it, is that iOS 8.4 has a glitch in it. I ran into the exact same problem. I turned off iMessage, then turned it back on. The Text Message Forwarding section within the iMessage section of Settings was missing. Got that Apple support?? MISSING. As in, not there. Not an option. So, when you guys send me to a site asking to check on Text Message Forwarding, it's not an option. Why? BECAUSE IT'S MISSING!! Apple sent out an upgrade for iOS to include that stupid "Music" BS and screwed up a bunch of other sections within the OS itself. I had this fixed once and it took me 1.5 hours with a "specialist" to accomplish this. They should have the "fix" to their GLITCH (i.e., not my problem) on file. When I get it, I'll pass it on.