If one is numb always, then they are probably not receiving the full experience of being a human (the thoughts, sensations, feelings and emotions). These things are a part of being human. If they want to be completely numb all of the time, they may be better off as being a conscious rock (an inanimate object with an ability to observe) rather than being a human.

The experience of singularity is important and profound though. It is like lifting a veil that clouds our consciousness and reveals the true nature of self and reality. One beyond thought and belief. But could a person live in such a state continuously and would that be beneficial? of that I am not sure.

It may be best to step in and out of such states (i.e. singularity and duality). That would allow the individual to experience their life as a human to its fullest but also to remain grounded in that - this is all just an experience - a temporary one at that. Not something to take too seriously.

Just my thoughts. You posted only two lines but it really got me thinking lol. thanks