Please Tell Me When Good Manners Went Out Of The Window, Thank You

In recent times, especially in this always-on, 24/7, hyper-connected society we live in, I've noticed that people have forgotten how to say "Please" and "Thank You." Even worse, as it shows a total lack of respect, is when you send someone an e-mail -- especially on a professional basis -- and they don't bother to even respond.

Everyone is busy (we get that). And people say that technology has contributed to an over-abundance of information (it has) and the feeling that you have to respond to someone almost immediately to stay in their good books (you shouldn't).

But what I fail to comprehend is why do some people need to be contacted more than once, within a VERY reasonable time frame, before they respond? Shouldn't [mobile]technology make it ultra-easy to simply send a "Got it thanks, busy, back to you soon," or "Not moving forward, please contact us next time," or "Working on it, thanks."

Don't you prefer these curt, respectful responses to none at all, or is it just me that hates to be left in limbo and would rather know either way? Not asking too much? Or am I wrong?

Thanks for reading and please come again.