The BizJet is just the tool and could be anything from a small single pilot jet up to a 747. There are plenty of Public Transport BizJet operations that are run to standards as high or higher than the airlines.
The problem is that some airline ignorami confuse these with the few private operations where there is little oversight and a wide range of standards. It's a bit like BizJet operations thinking that airline pilots have poor handling skills and a propensity to watch the automatics land them in the water just short of the runway on a gin-clear day. An uninformed and bigoted generalisation eh, Shaun?