Programs are a lot more complex. The computers aren't. They were far less homogenous in the early years. Today you have a octet addressed little endian integer

Programs are a lot more complex. The computers aren't. They were far less homogenous in the early years. Today you have a octet addressed little endian integer machine, with ieee float hardware and a small vector unit. Maybe you have two different instances of that on the same address space, but probably just one. I think reasonable argument could be made that the complexity in modern computing is primarily self inflicted by software engineers.