The head above appears to have adequate support needed (without welding up the head, which can cause warping, cracks, etc.) which is a good thing.
These steel seats are an improvement. All seats require a heavy press fitment. If seat fitment is not tight enough, the head expands(from the heat) and the seat falls out. I have the original bronze seats still in my panheads, stock from the factory. Hopefully I can get a few more miles on them before they need replacement? Old Harleys just keep on runnin' - 'til they don't !