VGA was adequate, and the being the first proper "standard" in video cards it was widely used. However IBM's XGA and 8514/A adapters were superior in terms of resolution and colour depth, so third party manufacturers created SuperVGA. It is unclear why these manufacturers chose to develop a new standard for higher resolutions with greater bit depth when IBM already had a chipset that provided this, but the logical guess is that it was easier to enhance VGA than to adapt XGA to be VGA compatible. Again, we were back to standards hell. Because it was 3rd party manufacturers and not VESA that created SVGA, all the implementations differed. To try to resolve this, VESA created an SVGA standard. However, instead of defining the implementation of SVGA as it did with VGA, VESA defined a standard interface called VESA BIOS Extensions (or VBE). This allowed developers to use once again a common interface to work with different makes and models of graphics card.
Whilst the capabilities and power of graphics cards have changed, this interface has not. Super VGA and the VESA BIOS Extensions are still in use on graphics cards today.
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