My sense of this discussion is that there are engineering reasons to use marine wiring and even marine hardware (although it hasn't been part of the discussion so far).
But it's an issue of cost versus benefit.
We all seem to be weighing
the benefit side differently because there is more than an engineering side to the benefits.
Fully tinned wire is better for corrosion resistance but not all of us are near the ocean and salt air is probably the leading contributor to corrosion.
Increased strands and cross sectional area does reduce losses from resistance but if most of our time is spent hooked to shore power then it's less of an issue (benefit).
I only use stainless hardware, but much of it is installed inside the trailer. I think it will look good longer and it suits MY personal sense of what I want MY work to look like. That may be of little benefit to others.
I haven't seen any dangerous recommendations so far. Mostly just people reporting what works for them.