1) a CSP can't make money off of cost tools and anything that doesn't generate revenue will always be de-prioritized. You could make an argument that having good cost tooling natively will prevent churn (which is probably true) but still this only retains revenue that other products generate rather than generate new revenue itself. I don't think there is a world where customers wouldn't be enraged if AWS started charging for Cost Explorer even if it meant a better version of CE.
2) All of the product teams that generate the cost data are not incentivized to make the cost data easy to understand or sensible from a billing perspective. They are incentivized to generate more revenue. It feels as if AWS billing is meant to be easy for the product teams to bill based on rather than for the customer to grok the bill.
Less hops generally means better performance.