I recommend that you take a look at the tutorial, for very obvious reasons.
The “typical” pistachio grafting system is the T bud system in the vegetative state, but North American hobbyists do not have access to short-cycle (very early maturing) pistachio varieties.
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Being able to graft very early maturing varieties, which are suitable for American states with not very long summers
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Possibility of sending grafting material in good condition to North American hobbyists, since the graft cuttings in a vegetative state only have one day of useful life (the grafters carry beach coolers with ice and the cuttings when grafting in the field in the month of July )
In summary, the system allows the useful life of the grafting cuttings, since it is carried out with cuttings in a state of winter dormancy.
Regards
Jose