Whatever the following subtle GTD nuance might be worth, if anything, hopefully to intrinsically in increasingly understanding for decreasing any unnecessary deliberation(s) to anyone interested?
Time-Blocking seems to be, at least to some degree, a pursuit of increasing control for completing what needs completing?
From an error-prone subjective GTD perspective:
Contexts, especially in regards to Next Action(s), is seemingly more about necessary conditions; in a familiar place with necessary particular tool(s) through completed preparation for easier completion
while
Calendar is seemingly more about preparing for an external 'moment' in time with more unforeseen~uncontrollable realities?
Thus, as perhaps often seemingly underappreciated of all necessary preparations, it might be worthwhile, If anything, perhaps 'increase' one's empathy, patience, and sympathy with oneself an/or others in regards to external anxieties in the midst of unforeseen external variables beyond one's capacities even while one sought to address all variables as best as possible without needing to leave ones' abode for errands, get-togethers, etc. without a wheeled suitcase for all possible possibilities?
As one sees GTD fits best. . . .