Knowing the peak power dissipation at max turbo frequency wouldn't be quite as informative as you might think. The problem is power consumption varies widely depending on the workload. Presumably Intel would be expected to report power for the worst-case workload, but that would be significantly higher than what most people will ever see. This will only get worse once mainstream CPUs get 512 bit AVX units, further increasing the spread between integer only and AVX heavy workloads.
I think the basic problem is that power management on modern CPUs has gotten complex enough that you can't really summarize a CPU's power consumption in one or two numbers anymore. To really get a clear picture takes a full blown datasheet with tables showing power consumption under a range of conditions. Frankly, most enthusiasts aren't equipped evaluate such detailed information. Instead people rely on a few sparse data points provided by tech review sites and generally just throw a really big cooler on their CPU and hope for the best.
I would also be interested in manufacturers diclosing their idle consumption, because that's another area where one can save a lot of energy given the amount of time most desktop and servers spend in that state.
The Problem is that both the cooling and the power supply both work with one simple number, and we have to know what the CPU needs in order to put it in a system.
It's easy to make an Intel CPU stay within the limits of a particular power supply and cooling system by setting PL1 and PL2 appropriately. It's a Heisenberg's uncertainty sort of situation. You can fix frequency and get variable power dissipation, or fix power and get variable frequency, but you can't really fix both at the same time.
Enthusiast users building desktop systems tend to massively over-provision both power supply and cooling anyways so it's usually not an issue.
I think the basic problem is that power management on modern CPUs has gotten complex enough that you can't really summarize a CPU's power consumption in one or two numbers anymore. To really get a clear picture takes a full blown datasheet with tables showing power consumption under a range of conditions. Frankly, most enthusiasts aren't equipped evaluate such detailed information. Instead people rely on a few sparse data points provided by tech review sites and generally just throw a really big cooler on their CPU and hope for the best.