I hate how little room is available in light switch electrical boxes, mostly due to way more wires being in them than necessary. I've been slowly switching out my standard switches with smart switches, and the smart ones are quite a bit bulkier in the back as expected. Trying to cram everything in after wiring them up always makes me worried that something is going to break. Why does a single light switch need 4 neutral wires and 4 load wires running to the box, when on a standard switch only 2 of the load wires are used?
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