> There is no worry with electronics ... high-altitude EMP. The wavelengths are too long and electronics are too small.

This is true for the E3 (second-scale) pulse and CMEs, but the E1 (nanosecond-scale) and E2 (millisecond-scale) EMP pulses are broadband and can indeed damage small electronics.

https://www.youtube.com/watch?v=XQwv02RP8F4&t=8s