Hey Nik
I was always taught that Maretts don't like vibrations and can't be trusted to hold things secure.
I am also not a fan of crimps for most applications (attaching fusible links would be the exception) but prefer to solder and shrink.

I like to keep my positive wires well secured, and see no sense in doings things part way, but am glad it works for you.

Given that OEM parts are still available and affordable, I don't see the point in taking chances.
BB