FWIW I follow ABYC and other (e.g., USCG) when I myself DO NOT use soldered connections anywhere on a boat's electronics. Many boats that have burned have been found to have soldered wiring, which hardens it and makes it fail in a hostile marine environment where the boat is subject to repeated bounces, i.e., choppy seas.
I used heat-shrink, length to the wire at least 1.5X that of the connector in size and even goop up my connections in the bilge with 5200 first, then cover them with the adhesive-lined HS.
I have never had a wiring or connection failure in 30+ years of working on my boats and wiring boats for others. Are you a good solderer? Good - go for it, just do not rely on it as the sole means of connection (same as ABYC, BIA, and USCG states in their wiring standards.
Just think back to Apollo 13 and recall that the entire incident was caused by poor soldering technique ...