One of the many challenges of staying compliant is that the feedback loop can be incredibly slow. By the time you find out there is a problem, it might be months after it became a problem. For example, if there is a payroll report that was not filed in Q3, you might not receive a letter about the failure to file (and penalty) until Q1 of next year.
One of the reasons for the slowness is the reliance on snail mail. It can take weeks to post the mail then more time to deliver it and yet more time for someone to check it.