>1) Based on actual test results, crimping is better than soldering.

Read something interesting about all this a few months ago.  It turned out
that after long term reliablitiy test done for satellites, and other really
too expensive to let them fail stuff, it was found that the reliability of
electrical joints broke down to this.
Most reliable:  Wire rap. easy and fast
Pretty reliable:  Crimp, easy and fast
Not very reliable:  Solder, connections cracked under vibration and flexing
of cables, hard to learn

All the circuit boards in the satellites they were building had wire rap
post for attaching cables.  It seems that when subjected to vibration this
type of joint just didn't fail anywhere near as often as any other.  But
how would you apply this to a car or truck??