I am not quite clear the point you are making? If you mean once a person's tinnitus stabilizes or they habituate, it means they no longer need to use sound enrichment during the day or at night, it all depends as it's more complex than that.
Tinnitus comes in many forms and intensities and no two people experience it the same. It is a very common condition. Ask members of your family, friends or co-workers if they have experienced tinnitus and you're likely to be told: "I've had it years and just ignore it. "Mine only bothers me in quiet surroundings but it's nothing". "It plays a funny tune but it's no problem". "Tinnitus is nothing you'll get used to it". Tinnitus is all these things and a lot more.
Most people that visit tinnitus forums regularly for help are a small minority, compared to the millions around the world that find the condition a minor irritant or no problem at all as mentioned above. These people are able to carry on with their life doing everything that they want and may never have attended ENT for help with their tinnitus. They would have habituated after a period of time and don't feel they need sound enrichment at night and that's fine.
All I am saying tinnitus affects each of us differently. However, when a person finds this condition problematic and needs to seek help at ENT or be referred to an Audiologist for treatment such as: CBT, TRT, Counselling, Sound Therapy or medication to help manage the tinnitus, it takes on a whole new meaning. For this reason the people mentioned above in my example, that have successfully habituated or have tinnitus relatively mild, have no idea how debilitating it can be for some people.
One has to experiment to see what works for them. Some people don't use sound enrichment while others do. My reason for using sound enrichment at night is not to induce sleep, it is to supply my brain and auditory system with sound, so the brain doesn't increase its background activity and thus the tinnitus because it can only hear silence.
Michael