I'm a Filmmaker.
You can view some of my work in the showreel provided.
I hope you like it. If you don't, it's not from a lack of trying.
Correct, I haven't had any nasty moire issues since I started shooting :)
And even though very few people have 4K monitors or televisions, as some have pointed out, shooting in 4K for 2K delivery yields some obvious benefits. But in the end it's about the content and how that tool helps you.
Agreed. That's the broadest question you can ask in terms of filmmaking.
There is no single answer.
It's funny, when I purchased my GH4 I put up on my personal facebook page something along the lines of "Now, before anyone tells me where I should have put my money, I do realize that this isn't an Arri Alexa or RED Dragon. But it is a nifty little camera right in my desired price range, and I can't wait to begin creating with this guy"
Was 4K a factor when it came to my decision? Sure, having an image at that resolution will allow me a few more options in post and I guess I wanted to be as future proof as possible in an age where that isn't really possible, but it was always about getting out there and creating content with affordable tools. Just as the OP is frustrated about this whole 4K "fad", I'm frustrated with the constant gear comparing where people will look down on you for purchasing a brand over their own choosing.