Why are there three excuses for a better discrete graphics card: DVI, HDMI and VGA? Why not unify the interface?

VGA is the oldest video standard, which transmits analog signals with limited bandwidth. The interface is 15 pin, which needs to be converted from analog signal to digital signal, which is very wasteful. HDMI and DVI transmit digital signals, and the displayed images are purer and more realistic. HDMI can transmit 1080P HD signals and audio signals without any pressure. The interface is 24 pins. Due to the high signal transmission voltage adopted by DVI in the standard, it can not effectively reduce power consumption, so it is replaced by HDMI, but HDMI maintains compatibility with DVI.

First question: Are there three interfaces on a good discrete graphics card? I don't think so. Whether the discrete graphics card is good or not depends on whether the display core is good or not and whether the processing power is enough. Of course, there are three interfaces, which shows that this graphics card is very professional and universal, and there are many materials used on the circuit board. Of course there can be a good price. Low-cost graphics cards will not add so many interfaces due to cost reasons, and there may only be one VGA interface;

Second question: As can be seen from the above, the standards are different. VGA and HDMI and DVI cannot have a unified interface, but HDMI and DVI can be compatible.