This may not be a negative at all. With any connector (BNC or DB-15) there is a possibility of an impedance miss match that could send ripples up and down the video cable. The ripples can be amplified by the video amp and show as shadows or ghosts after light to dark or dark to light transitions on the screen.
Most manufacturers are taking the connectors (BNC and DB-15) off the monitor all together and permanently attaching the cable to the monitor. By doing this they can solder the cable wires directly to the video amplifier board inside the monitor, effectively eliminating any chance of impedance miss match on the monitor end from a connector. An added benefit to a permanently attached cable is, you will never loose it, should you move your system. In any scheme there are trade off. The trade off in permanently attaching the cable is that if the cable should go bad, you need to send the entire unit in for service. My experience says that occasionally cables do break, but the failure rate of cables is very low.