By not indulging in sensory delights, the objects apparently recede, but leaving behind the lingering taste for them. But the taste too vanishes after realizing the supreme Truth.
Physical sensory control is effective and helpful, no doubt. But it does not complete the process and pursuit of spiritual sādhanā and bestow fulfilment. True realization, consequent enrichment and inner fullness will alone wipe out the lingering for sensory thrills.
Personal absorptional sādhanā leading to Sthita-prajñatā is, however, the decisive factor in spiritual seeking. Krishna’s dialogue exposes the subject, no doubt. This alone is what Krishna could do before the actual Kurukshetra battle began. Arjuna did derive adequate insight, clarity and inner strength to fight.
But all this does not invalidate the place and purpose of spiritual contemplation and the still absorptional Self- experience it fetches. Krishna wants to emphasize this point. By firsthand inner spiritual experience alone will the subtle notes of desire be extinct. In other words, Sthita-prajñatā is indispensable for a seeker.