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what for? one can hardly finish one design to the managers deadlines. It may be ok for research purposes.
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In the early days, when VHDL was created, there were no synthisizers available. At first, VHDL was only for simulating behavior.
Hardware design were done using graphical editors were you could place polysilicon, diffusion and metal layers, basically transistors and gates at the logic level.
So a designer would like to simulate on a high level but had to rewrite the design to a lower level and test if the behaviors are identical. VHDL supports this with multiple architectures.
Nowadays, there are synthesizes available that can synthesize from RT-level, so the need for multiple architectures is probably no longer needed.
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