Quote: " The bulk cap is of high importance because it deals with very high voltage (loosely regulated 380VDC bus voltage), which can easily shorten the lifetime of a low quality cap. "
??! The primary side high voltage capacitor quality makes less difference among all electrolytics in the average PSU, and especially in this simple design. For quite a while manufacturers even got away with using 85C rated models there, and not particularly low ESR. In this design it's only operating at line frequency, a pretty low stress job. That it's high voltage is somewhat trivial, merely thicker separator/oxide layer, the latter forming itself.
In order of importance for use of quality caps, first there are those on the 5VSB rail, primarily because a system may have load on that rail with in a soft-off state so the fan isn't moving air. Second, or first on a gaming rig, would be those on 12V rail since it tends to not only have high load but larger current changes from different CPU and GPU states.
These statements may be overgeneralizing and assuming a typical system load, but that is also what Super Flower is designing for with shared regulation.
Ultimately I might buy one of these PSU if cheap enough, but as mentioned above I would gladly pay $5 more for them to use polymer capacitors on 5VSB, 12V, and Jap. electrolytics would be acceptable on 5V and 3.3V.