Factories don't necessarily do things "right"- - - -they choose to use the methods that will get a vehicle through its warranty period with a minimum of free repair work. If you're interested in your wiring lasting more than 8-10 years without problems, solder the connections. Crimped connections are "good"- - - -properly soldered ones are "better". A poor soldered connection isn't as good as a crimp done right.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!