buggy programs

did you ever use a program that was buggy, and you wondered how the authors could have released it.  don't they use the program themselves?  how could they not be aware of the bugs?

Here's a modified version:

// Super High Infrastructure Technology Operating System
// v2.00 COMPLETE RELEASEVERSION NOT BETA
//
// Theory of operation:
//  Programs run best when they have direct access to the hardware
// and don't have to go through an intermediate software solution
// to function.  Furthermore, introduction of such a software layer
// (better known as 'kernel', 'BIOS', etc. to primitive minds) only
// serves to introduce bugs while decreasing execution speed.  By
// eliminating the entire notion of operating system services, we
// assure maximum performance.  Programs are all expected to write
// directly to hardware.

int main()
{
    printf("Welcome to ShitOS v2.0\n");
    return 0;
}