I think there are two questions that need answering:
1) Is it unsafe to use the improper ratio of soap:water (i.e., will this strip my LSP, dry out my trim, dissolve epoxys, etc.)?
2) Is it simply an economic/environmental issue to use more or less soap than the recommended?
I think with certain shampoos (Chemical Guys Citrus Wash and Gloss comes to mind), having a higher concentration of soap will actually (or is stated to do so) strip your wax or to some extent your last step product. However, does having a high concentration of Chemical Guys Honeydew, Mr. Pink, GG, DP Xtreme Foam (just examples) increase the risk of stripping LSP?
(I'm actually curious myself.)
Because if for the majority of shampoos ratio doesn't really matter in terms of what's safe for your car, then it really boils down to economics and environmental factors.