The biggest problem is that analog is nothing like digital - BTW my PhD thesis back in the 1980s was about this. You can make it work at low frequencies that a

The biggest problem is that analog is nothing like digital - BTW my PhD thesis back in the 1980s was about this. You can make it work at low frequencies that are essentially "DC". Higher frequencies simply can't work - too many parasitics plus lumped equivalent fails. formerly_proven hits the nail on the head.