Why isn’t the op-amp utilized in the open-loop setup as an amplifier?
The following factors prevent the open loop op-amp from being utilized in practice:
The amplified output signal exhibits distortion because of the extremely high open loop gain.
The gain in the open loop changes over time. It changes as the temperature and power supply fluctuate.
In the open-loop mode, an op-bandwidth amp is practically nil. Because of this, the open-loop op-amp is not typically used as an amplifier.
Nevertheless, open-loop configurations of op-amps are used in applications like comparators (both inverting and non-inverting comparators).