How do you feel about crimped then soldered?
I feel it's counterproductive, and a waste of a good solder terminal plus an inch of each wire.
What possible benefit can there be to crimping a good solder joint? The solder is mechanically stronger than the crimp (by a WIDE margin). And crimping doesn't improve the electrical connection over solder. All it does is prevent the joint from being separated; the terminal can never be emptied & reused, and the wire can't be removed without cutting some off.
So what can you even hope to gain from it?
I've heard people argue that "if it gets hot, the crimp will keep the wire from dropping out". Maybe. But there will still be liquid solder running out, shorting other things & maybe even setting them on fire.
And if any of my soldered terminals ever gets hot enough to melt the solder, I WANT
the wire to fall out. Maybe it'll break the circuit before the terminal catches fire, or the battery explodes. If there's THAT much current flowing, and THAT much resistance at that terminal, keeping them together is NOT helpful.
It just happens to start every time for some reason.
The reason is that they haven't had enough time to corrode to the point of you noticing the problem. But they will...
Then they were covered in adhesive heat shrink.
Why? It's strictly cosmetic - it has no function (IN THIS APPLICATION). The solder seals liquids out of the wire strands, and the ring terminal is still exposed. So the heat-shrink doesn't seal or insulate anything.
The entire terminal is covered in superlube anti-corrosion gel.
The only places that matter are where the rings touch other metal. But if they weren't shiny-clean before you applied the gel, you aren't protecting anything.
...everything is very serviceable.
Solder is, too. But it doesn't age like a stack of rings does. And it has less resistance. And it costs less. And it takes less time to make, or repair.