In Chapter 7 of my Relativity without Spacetime, Section 7.2.3.3 (p. 157), I observe that for "any Newtonian weak field reduction" of Einstein's gravitational field equation, whether vacuum or non-vacuum, all metric components other than g44 drop out. Of course, for a weak/static field reduction in general, the g11, g22, and g33 metric components do not drop out. In his 1916 paper Einstein makes an additional stipulation, though, which accords with what he calls the "second