What I'm looking at here?
This is a picture of my guest bathroom sink, and the hot and cold inlets are each connected to two or three seemingly redundant lengths of copper tubing:
My first guess is, the plumber who built this in 1978 needed to add stability and, being a plumber, used what was handy. But that can't be right, can it? That's a lot of wasted solder, considering a 2x4 and a couple of nails would have probably accomplished the same job.
The kitchen sink plumbing has the same feature.