ELI5: There are rockets that can’t be blocked by the dome. There is another system for these rockets but they can be overwhelmed easier than the dome. (They still block, but not as efficient as the dome so way more rockets hit.)

I thought only South Korea and Taiwan would react this way, as they liteary depend on the US for defense. I expected more fortitude from the Japanese but than again their economy was already fucked to beginn with and it’s not like they are buddies with China.