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Because it could be an essential part of the circuit.Why not wire in a little LED and dropping resistor? Save you from having to replace the incandescent when it burns out.
Grain of wheat lamps are often used as PTC resistors in things like wien bridge oscillators; if you replace it with an LED it might not work.
Luxeon have very expensive and very powerful wide-angle LEDs.You can get LED's with 160° angles and even wider.