Rather than a resize or a timer, I'd prefer to see the tappable area changed to exclude the most commonly used hot spots on the screen, such as the top left and right corner.
It could also detect when there is a tappable element under the tap-sensitive middle of the notification, and introduce a short delay only in those cases.
If there was to be a delay, 0.5 seconds sounds way too long. More like 0.2 - 0.3 would be good, and in the meantime (during the delay) the banner could pass the taps through to whatever element was visible before the notification came along.
It could also detect when there is a tappable element under the tap-sensitive middle of the notification, and introduce a short delay only in those cases.
If there was to be a delay, 0.5 seconds sounds way too long. More like 0.2 - 0.3 would be good, and in the meantime (during the delay) the banner could pass the taps through to whatever element was visible before the notification came along.