Thank Your SirThey are critical. Those capacitors are not important to simulation but they are shown so they will not be forgotten when a real circuit is built.
One big problem with amplifiers, especially RF circuits, is when the output currents get back to the input stage which can then cause oscillation. So the design of the power supply as a low pass filter is as important as the design of the signal path.
It is important that multiple capacitors of different construction are used to bypass the supply. Electrolytics are slow and have high inductance so will need a faster capacitor closer to the circuit. Inside the circuit where active components connect to the power supply there will need to be fast ceramic capacitors, say 1nF.