If the theory that the US closes off energy flows from the Middle East specifically to China is correct, then the closure of the Yemen red sea strait is desired.

Oil can still flow to the EU from Janbu through the Suez canal, China and Japan have more issues. Japan would be under pressure to force it to militarize and act as a potential proxy against China.

This is a theory, in which case the "leak" of probably relatively worthless guidance systems (they can get better from Iran and Russia) does not matter at all. The Houthis taking islands would also be encouraged.