Brief and simplified discernment to strengthen and complement https://www.youtube.com/watch?v=o4uMW_qFGjw and https://www.epistemologyontologyfoundationinstitute.org/nature-decode/on-subtle-body-mind-and-transition-or-evolution-beyond-known-physical-world. And to support individual and collect ice inspirations, aspirations, yearnings, and the common and greater good.
Since life and existence is the interdependent and interconnectedness process basing on the essence, nature, and ground of being. And nature, transition or evolution from one realm to another is based on the essence and nature of being and becoming. And as such, ways of life and practices that better being and becoming would strengthen the transition.
Death process practices by ancient wisdom traditions basically is to help an individual to harmonize and resonate with sum of parts of the greater whole. And the greater whole. And as such can be crucial or make the transition easier and better. However, equivalent practices can also be practiced as parts of daily living which would complement or naturally help such practices at end of physical life cycle. And if made part of holistic development and living, would become natural ways of life.
The Wikipedia definition "Thukdam (Tibetan: ཐུགས་དམ་) is a meditative practice, practiced in the post-mortem period of a Buddhist master. In that time they are absorbed in ‘Clear Light Stage’, a process of inner dissolution of the five elements and consciousness back into the Primordial Light" correlated with phenomena which correlated with natural processes and mechanisms (i.e. gradually and stable resonance process and mechanism of intertwinement and entanglement with nature or the greater whole now known to science, on going or in progress, and interconnected explorations) about an individual practicing non-attachment and peaceful heartful-mindful care loving-kindness to harmonize and resonate with nature during the transition from known physical to beyond realms.
These were once forbidden and hidden knowledge and practices or off limit to the mass (and even public monasteries) can now be made inclusive or open, relatable, applicable, relevant, and practicable potentially to or by all. And as such, people and communities are encouraged to be parts of solutions for the common and greater good. And long lasting benefits and betterment for all in the known physical world. And beyond.
Updated 06/18/2021: Related epistemology and ontology
On Subtle Body-Mind. And Transition or Evolution Beyond Known Physical World - EPISTEMOLOGY OF LIFE AND ONTOLOGY OF EXISTENCE FOUNDATION AND INSTITUTE (epistemologyontologyfoundationinstitute.org)
On Body-Mind Phenomena and Nature of Spectra-Field - EPISTEMOLOGY OF LIFE AND ONTOLOGY OF EXISTENCE FOUNDATION AND INSTITUTE (epistemologyontologyfoundationinstitute.org)
Epistemology of Life and Ontology of Existence Foundation and Institute