Soldered Joints, Crimped Joints

I've done AMC wiring since the early 1970s......
I currently have two 68 quart tubs full (and I mean PACKED FULL) of AMC harnesses and parts (mostly from 64 through the mid-70s) and another 32 quart tub with mostly NOS sub-harnesses and wiring connectors and pigtails. I have another harness I'm using as needed for my own 73 (interesting how the alternator output wire and the link for the horn relay are connected)

Part of it may be that many people believe for it to be a soldered joint they have to see a glob of solder and the mess of human soldering. 

A lot of soldered joints in electronics and industry are automated (ever seen printed circuits and electronic devices being made up close and personal? I worked at CCC - high end control systems with harnesses, connectors, and complex boards. .Then there was CEMENTECH where I did consulting work on their networking and other equipment - they make concrete handling equipment for military and industry and there were specs for the thickness of paint on each part.)
Some soldered joints have very very little external sign that it's soldered - until you try to open it up to re-use some of the parts and realize that just relaxing the crimp doesn't release the wires.....

There isn't always someone sitting there with a soldering iron or gun and getting cold joints, excess solder drips, etc - sometimes the connectors are pre-tinned, sometimes wire is pre-tinned - just add heat. Sometimes things go through a "bath" of molten solder. "it depends". I watched the manufacturing process for those control systems (some of them selling for close to a million bucks)