Advice on Swap to Dot 5 - New MC

They can't talk about stratification if they're not mixing them, and they specifically state that DOT 5 is exempted from non-stratification requirements

Re-read it. It's saying, if you mix 3 or 4 or 5.1, they can't stratify. DOT 5 is exempted from this requirement.

Put another way, 5 can be in the same system, and it can 'layer out', whereas the others have to be miscible.

"Test fluids, except DOT 5 SBBF, shall be examined for stratification."

Agree. Silicone Based Brake Fluid is not tested for stratification.