I work for Amazon. Charts, graphs, and other supporting data are permitted in the appendix, which can be of any length. They are forbidden in the narrative itself, however.
if charts and even data is prohibited, then how do you make a business case for something ?
Like otterley said, you put the data in the appendix, and refer to it like a citation. This is standard practice in any technical document already.
You use ‘it is known’ a lot, with a bunch of references to the appendix?
Typically you'd make a succinct verbal statement in the narrative like "customers tell us ____" or "___% of ______ do ______", and show the survey or other relevant data that supports the statement in the appendix.
I'm not sure about Amazon, but we do the memo thing at Jeff's other company, Blue Origin, as well. Charts are fair game and I've used them a few times. I've noticed others at the company use them too, but sparingly.