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Some online discussions imply that the factor of 8π is simply for the convenience not having to write it elsewhere. This is not the case: particle physicists take their 4π's seriously.
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https://twitter.com/FlipTanedo/status/1648839447625232385
yes! and thank you for i am also reminded that i must not use the term energy-momentum tensor for (16) in my draft since by strict dimensional analysis (16) is dimensionless (without units) so i would rather use the term "source tensor" in the (1+1)-dimensionally reduced GR
https://foxtrotpaparomeo.wordpress.com/2023/03/20/20032023rough-draftstatic-solutions-to-einsteins-field-equations-in-11-space-time/