I think someone needs to learn the difference between 4 Rails and 4 Connectors. Before they melt down a shiny new miner and blame it on the manufacturer.
This is why these manufactures need to be providing power supplies. I've never gotten the point of not providing one. Other than to make it difficult to figure out what the hell you're doing.
Because most miners already have a fleet of PSUs and don't want new ones with every miner?
Because most mining rigs ship from China, and miners don't want to pay to ship an extra several pounds across the planet?
Because a manufacturer would sell the rig+PSU at a profit, whereas most of us find extreme deals on PSUs and then buy a case of them at 50-75% off from retail?
If you really need a PSU and a completely set up rig, there are resellers that do that. Resellers are better in that situation because they usually provide local (i.e. English) tech support, don't require you to install QQ and speak Chinese, and are awake around the same times you are if you do need assistance.
So what I'm saying, is no one wants manufacturers to bundle PSUs with their rigs as a default. And those who do, don't actually want to be buying from manufacturers, they want to be buying from local resellers.