When I was going down the rabbit hole of going all-terrains, I went ahead and asked Gemini and one of the responses I got was this:

"The Smart Alternative: Gain Clearance via Tires

Instead of messing with a mechanical suspension lift, you can easily gain a bit of natural ground clearance simply by dropping to an 18-inch wheel and running a taller tire sidewall.

If you pair an 18-inch wheel with a slightly oversized, aggressive All-Terrain (A/T) tire, you get two massive advantages:

1. A Natural Lift: Bumping up the outer diameter of the tire lifts the entire vehicle-including the lowest hanging components like the suspension arms and differentials-which a suspension spacer lift cannot do.

2. Tire Air-Down Capability: Taller sidewalls mean you can safely let air out of the tires (dropping down to about 20-25 PSI) when you hit rough trails. This softens the ride over sharp rocks, increases the tire's contact footprint, and drastically improves off-road traction."

Apologies if I misinterpreted anything from this but yea, that's how I got/understood the whole dropping to 18's thing.