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Solder and crimp isn't a "belt and braces" thing.
The crimping is necessary for the terminals to enter the housings correctly.
It also happens to be a handy way of holding everything tightly during soldering, as well as minimising the amount of solder in the joint.
It's just the sensible way to solder them.
For Superseal connectors, I have found that any stiffening due to solder "wicking" up the strands is extremely minimal and is in any case confined well within the semi-rigid terminal, with the wire and insulation being further supported by the body of the connector itself and the seal .. thus in my judgment the critical area is protected from vibration induced failure.
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