It's an entertaining hack. I think it should be considered in this context.
If we start thinking about it in practical terms it stops making any sense. Specifically, a standard 2 layer board costs few $ to make. Here we're paying a huge premium for extra internal layers. You may as well take that money and put it towards a hob with an scr and a cheap controller to solder them on it.
That actually depends on the specific costs. There is a clear business desire to replace capex with opex even when the resulting expenditure is higher. This achieves that at the pcb soldering level.
It does not have to be a good idea to get traction.
If we start thinking about it in practical terms it stops making any sense. Specifically, a standard 2 layer board costs few $ to make. Here we're paying a huge premium for extra internal layers. You may as well take that money and put it towards a hob with an scr and a cheap controller to solder them on it.