Sure 2% regulation is cool, but does it really make much of a difference compared to say 5%? The computers are going to run the same...
I'm not expert....I leave the expert opinion to JonnyGuru. But from what I've seen over the years, tighter voltage regulation, esp. under heavy loads, is usually indicative of a power supply's overall component robustness, and design and build quality.
I do understand that the ATX spec allows the major rail, the +12V rail(s), to droop to 11.4V under full output, and that computer components are designed to work with that low a voltage being fed. And, as you suggest, most bog standard computers probably aren't going to be affected by that.
But this power supply, and those built to higher standards in voltage regulation, efficiency, ripple/noise generation, etc., aren't focused at or marketed towards the mon-n-pop email/Youtube/web surfing crowd. Instead, these power supplies are focused on the enthusiast crowd, the same crowd that will overclock their cpus, gpus, and darned near anything else they can push in their builds.
And when you're overclocking, voltage regulation does become important in relation to stability of said overclocking, all else being constant (overclockability of the cpu, mb, RAM, etc.) Too much droop from the power supply's output will cause the motherboard's voltage regulators to work harder to maintain a stable platform.
And tied into that is ripple/noise control. The power supplies that can provide 1-2% voltage regulation at full load typically can also suppress ripple/noise generation very well, too. And this is another area that can affect ultimate overclocks.....the mb/cpu's VRM's aren't having to work as hard "screening" out the garbage of overly high, but within spec, ripple and noise.
Again, this is just my opinion, but seems to be borne out by serious overclockers finding it easier to achieve stability with heavy overclocks when using "overbuilt" power supplies vs. ones that just meet the ATX specs.
I'd much rather my components be fed as clean and stable an electrical signal as possible...the components shouldn't have to work as hard as they would being given an electrical signal that's within spec but dirtier and producing lower voltage than a ps that can maintain tight voltage regulation and a clean signal.
This is why I'll pay a bit extra for a power supply that has first, tight voltage regulation; second, suppresses ripple/noise generation well; third, is modular; and fourth, is efficient. For mom-n-pop, probably won't be an issue.
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