apparently everything on mad electrical page is wrong
Not everything.
But some, like that statement, is misleading.
Because of that, their solution has its own flaws.
They also paint everything with one broad brush.
The melted ammeter they illustrate with a photo is a truck. Most likely a plow truck or truck with a winch.
Those pretty much have to be wired direct to the battery because of the current they draw.
The ammeters (and all of the connections) can get pretty abused with that type of use.
The alternator tries to supply power to the winch at 14 volts through the ammeter. It can't provide enough, so the battery doe sthe job. Then the battery needs a massive recharge. That goes through the ammeter. If the engine is idling, the current may be limited by the low alternator rpm. But if the engine is at anything much above idle, then it probably saw over 40 amps for long periods of time.
I've hooked up a battery on somewhat low in charge to a manually controlled charger. Supplied power at 14.2 Volts, the battery drew 35 amps. Photos
here. As explained in the link, I quickly cut that back so as to not risk overheating the battery.
Chrysler had its own heavy duty wiring solutions. Why they weren't always implemented on plow trucks, etc. I don't know. When I drove mid 80s Dodge trucks that were fleet purchases I didn't know enough to explore the wiring. They never gave us a problem, but that may have just been the way used them or could have been because they the 'fleet' wiring. No idea.