> Price simulators are fine.

Yes, as long as you do not have seasonal traffic, auto-scaling, spot instances, burstable instances, saving plans, reserved instances, floor/custom pricing, etc. These are tools to optimize your spendings and spend less if you know what you are doing.

> defending deliberately obfuscated pricing

A bit contradictory that price simulators are fine, but then the pricing is deliberately obfuscated. Then which one?