The interval between options increases as the list goes down. Adding 180dB does not seem to be very logic in this regard, i.e. It is too close to 200dB. we will give less priority to this improvement for the time being. Admittedly it is something good to have.
Sometimes, the gap between -150dB an -200dB is just too much. With current audio hardware performances, there is more and more relevant data around -150dB.