I'm the mod who locked it. There was a few key points I considered.
The quality of the answers was decent, but it was attracting an inordinate amount of snarky comments. I didn't particularly want to penalise the people doing the right thing - just send a message about the tone of commentary
In theory SU's kind of meant for folks of a broad range of skills, and this felt like something someone without a solid grounding in networking might wonder about.
Now if folks had voted to close rather than post comments that were snarky, or commenting on the snarkiness it might be closed rather than locked.
I also totally agree with what Ben said and
Personally, I would be inclined to leave the question open, since it's about hardware used in home setups, but others may disagree.