+1. nobody knows better how to design a PCB than the guys who design the chips. Relying on 3rd party groups (technobit for example) to invest in prototype boards for multiple chip types simultaneously is less likely to get an ideal resulting design - ie the series-based design for voltage control, exactly what bitfury managed to do
You would think that but then you run into a company like AM that produced the prisma. Multiple people including myself have had one spontaneously burst into flame. Then AM has promised compensation they have not delivered. For myself they promised a new prisma for compensation on the burned up boards that I paid to ship back to Hong Kong from the US. Instead they shipped replacement boards leaving me to repair the damaged heatsink and pay for shipping from the distributor they shipped the new boards to. Then when they started acknowledging the other boards that have caught on fire or just don't work they promised to pay for return shipping to Hong Kong and to compensate for downtime. Now if you look in the thread where they posted that, there are no responses from AM. emails and PM's go unanswered and aside from a few boards they sent which didn't cover all the damaged ones there is no compensation either.