Fun fact: it's very difficult to get rid of built-up charge in space. And guess what incident EM radiation does to your electronics: that's right, it can build up charge! To my understanding, this is especially a problem when charge is built up in specific dielectrics/insulators or the very delicate structures of modern transistors and other semiconductor devices. This so-called "total ionizing dose" [1] can lead to "leakage currents, degrade the gain of a device, affect timing characteristics, and, in some cases, result in complete functional failure" [2].Any RF or EMC engineer will tell you that ground is a dirty word, especially in extreme conditions. There's no one-size-fits-all approach, since so much depends on the physical context.
[1] https://radhome.gsfc.nasa.gov/radhome/tid.htm
[2] https://www.analog.com/en/signals/thought-leadership/challen...
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