> The difference here is that a) it is all upfront and b) the mfg can make an informed decision - is this worth it.
You sign the same deal when you sell on Amazon, probably even signing away more rights. I'm not sure I haven't read the full EULA when you sign up to sell.
> Amazon as a seller you can't plan as well - their alog or someone else paying for promo could cut your demand in half overnight.
This is about the only thing you've said I agree with. But it's not due to lack of data, it's due to barrier to entry with retail sales you have less competition. Right for the wrong reason here.
> Additionally retail stores actually drive demand / discover ability when they purchase your product in a way amazon often does not.
Amazon drives way WAY more discoverability than any retailer.
Pretty much your entire argument contradicts real world experience, common sense, and actual reality from what I know of the situation. I can tell you for a fact your assertion that 'Amazon doesn't do this' everything you're saying is 100% false.