Probaly 1st used for power gating and not for logic, low level logic that does not need speed.
If contact resisitanc eis made low enough these could be put in series to provide better MTBF for the case of stuck switch on.
Low frequency logic will also be applicable for this.
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Sounds fruitful, but I never see people who wear the current solutions complaining, I think they work well, but an improvement is always warranted. I remember my days working on electronics, before I got into computer net connections and other technical stuff, it was enjoyable to a certain extent, I think.