Often by the time I think of a response to something he said a second ago he's on to the next thing. Sometimes it even feels manipulative on his part, even though I'm starting to learn it's not intentional, because it seems like he's changing the subject when he's really thinking so far ahead. I've noticed it helps a lot when we need to "argue" something out if we are texting.
This makes perfect sense to me, only I'm often the one impatiently jumping ahead. I guess I too often assume that what seems obvious to me is just as obvious to my spouse and therefore not even worth mentioning, which leads to gaps in communication and frustration all around.
On the flip side, I often feel like my spouse is being dismissive, uncaring or at least unhelpful by suggesting "Why don't you just do X?" when I can instantly call up a dozen reasons why X is a terrible idea. I feel like he's deliberately oversimplifying things, while he thinks I'm making things too complicated. In reality, this is probably just a matter of how our very different minds work.