Swipe up on iOS, but that doesn’t help when you were milliseconds away from touching an onscreen control and it appeared. I heavily control what apps can show notifications, yet I seem to have this happen multiple times a day like the article author.

Yes, you swipe it up. This is a nonissue.

It is an issue, because as your finger is making its way to tap "Back" or "Done" the notification pops under it. It's like when an ad loads directly under your mouse cursor, overlaying something you want to click on, as the neural signal to your click-muscle is already halfway down your arm.

Its actually a huge issue. Please read the original post.