Please imagine there are hundred people sitting around the Buddha, and the Buddha must choose the compatible Dhamma, Dana/Sila/Samatha/Vipassana, with the listener's habits to let the listener attain LokuttataJhana.
According to the eldest Tipitaka manual, Netti:
- Unwholesome Habitual Person, TanhaCarita, needs to meditate Samatha to stop the present arising unwholesome because they can't control their mind arising to be just wholesome. Their unwholesome mind will arise instead of the wholesome, then the meditation will not develop uninterruptedly therefore Neyya's LokuttataJhana can't arise.
- Wholesome Habitual Person, DitthiCarita, don't need to meditate Samatha. However, they still meditate Samatha if they still have enough lifetime to meditate it. However, for the wholesome Habitual Person who has not much left lifetime, the Buddha will let him meditate only Vipassana, without Samatha.
For the unwholesome habitual person, he can meditate pure Vipassana, but its risk for him to die before he attains LokuttaraJhana because it is harder, almost impossible, to attain LokuttaraJhana around unwholesome arising.
What is wholesome meditation?
In short, an attainment/enlightenment (of both LokiyaJhana and LokuttaraJhana) is a graduating moment of wholesome mind development/meditation, so if some passion, unwholesome mind, still able to arise and interrupt the meditation, it can not be called "attainment/enlightenment".
In detail, a wholesome mind arises without any passion and causes at least the present and future resultants. In LokuttaraJhana context, wholesome mind causes of attaining the cessation of all sufferings as well. The 30-36 wholesome factors have to arise together with each mind moment depend on the compatibility with the environment and situation. The arising of wholesome mind moment will interrupt an arising of the unwholesome mind moment because the mind can arise only one per time (but it arises super fast more than a trillion times per second), so wholesome arising without unwholesome and wholesome arising without unwholesome.
All kinds of meditation are developing above wholesome mind to arise continuously uninterruptedly.
The Freshy Vipassana, TarunaVipassana, still has unwholesome minds, passion, arising around the present wholesome mind arising.
The proficient Vipassana, BalavaVipassana, has only wholesome minds arising for a long time continuously uninterruptedly without any passion, unwholesome.
The graduating Vipassana, AriyaMagga, is the perfectly completely ceasing moment of the passions by the powerful enough BalavaVipassana. The graduating Samatha can stop only present unwholesome mind arising but the The graduating Vipassana can let the passions ceased forever.
The attainment/enlightenment (of both LokiyaJhana and LokuttaraJhana) is a graduating moment of wholesome mind development/meditation, so if some passion, unwholesome mind, still able to arise and interrupt the meditation, it can not be called "attainment/enlightenment".
If one say Netti or Tipitaka conflict each other, it means that one doesn't know the right way to deconflict their misunderstood, wrong reading, by a lot of evidence, supporting each others. It doesn't mean Tipitaka or Netti actually conflict each other.