Sure, it's so easy to make a 700+ GH/s BTC ASIC that Superstar Chip Designers at Cointerra could barely match 400GH/s. 
Yes, it is easy. SHA256 is embarrassingly parallel. Making a big fat chip is just copy/paste. It's just a bad idea due to heat density and other issues. That's why companies that did big chips (HF, CT, BFL) had the biggest problems actually building working miners.