"do not expect companies to call you back, or be overly timely on most contacts."

So because thechnology gives us the excuse to be rude? Just opinion here, but if a business takes the time to bring a candidate in for a day of interviewing they are obligated to fnish the process which incldes delivering the bad news i they are not selected. I feel that anything less is bad manners and unprofessional, even if that has bcome the norm.