I would have preferred soldered connections and heat shrink instead of those blue crimp-on connectors...
I don't think you would have like the outcome with soldered connectors.
A long time (25 years) ago I worked for a company that made all sorts of specialized electrical connectors. what we found was that if we soldered any stranded wire on a vehicle (high vibration) the solder would wick down the strands for some distance and then stop. The end of the area where the solder wicked would cause a stress concentration and the wire would frequently fatigue and break right there. It would take a while, maybe several hundred hours of operation, but it would routinely happen.
Crimped connectors do not have this problem.
Crimp on connectors have a high failure rate. Crimped and wrapped (wire wrapped tightly around a square pin) connections have to be gas tight or they will fail. Unless high cost specialty tools are used by a knowledgeable person, the connections will not be gas tight, and random failures are pretty much guaranteed. Even professionally crimped or wrapped connections sometimes fail.
25 years ago I held a NASA soldering certification, which required me to attend a NASA certified soldering course. The reason for the certification program in a nutshell: Properly soldered connections don't fail in a high vibration and/or high vacuum environment. Properly soldered connections do not have solder wicking away from the joint.
I used to own a seagoing diesel powered boat. The wiring was trash. The absolute worst environment I know of for wiring is the bilge of a seagoing vessel. Think vibrating salt water spray bath. I replaced all the DC wiring, soldering all the connections. I covered each soldered connection with liquid vinyl, followed by heat shrink tubing. Not a single one of those connections ever failed.
I have a cargo trailer than came with crimp on connectors. They failed early on. I rewired it and added electric brakes while I was at it, using the same techniques as the I used on the boat. Not a single connection has failed since.
I have an equipment trailer that came with crimp on connectors. They failed right away, causing the loss of brakes on one axle. High on my project list is the complete rewiring of that trailer. Every connection will be soldered.
Years of experience have taught me that even properly crimped or wrapped terminals will fail if they are not carrying current most of the time. There is something about the constant movement of electrons between the two surfaces that helps keep the interface from oxidizing. I have talked to a number of people that have observed this effect.
In situations where circuits will be switched off the majority of the time, properly soldered connections are the only absolute protection against interface oxidation.
The only downside to soldering is the extra time it takes. It is usually well worth it.