Crimped connections and voltage drop

What are these connections for? If the crimp is tight enough to physically hold the wire in then there is a decent mechanical connection, and in turn a decent electrical connection.

Unless the connector or the wire is corroded very badly, or the crimp has been done on the insulation rather than the copper, a crimped connection is perfectly fine - Pretty much all the OE connections are crimped.

I crimp probably hundreds of connections every week, from signal wires to starter motor cables carrying hundreds of amps and I've never had one perform noticeably different to a soldered joint.