I should say that r. Akiba's buffling comment is way above my current theological paygrade. Somewhat at variance with the structure of the posting itself, I'd think that r. Simeon's saying seems simpler and helps us a bit towards understanding r. Akiba's; rather than conversely.
Of your references I agree with everything in 1st paragraph except "mere crystal" (see separate comment), and Soncino, with caveats (see below). R. Schneerson's explanation looks weak and questionable. 3Enoch/Hekalot and r. Yaakov are better, thanks.
I can throw in Rambam (MN 2:30) for good measure, who calls it "how clearly and distinctly this passage explains the subject for those who reflect on it!", and then proceeds to undermine this point with gratuitous(?) reference to meteorology. Yet again, perhaps here also "it was considered necessary to make this one of the most hidden secrets, in order to prevent the multitude from knowing it."
no subject
Of your references I agree with everything in 1st paragraph except "mere crystal" (see separate comment), and Soncino, with caveats (see below). R. Schneerson's explanation looks weak and questionable. 3Enoch/Hekalot and r. Yaakov are better, thanks.
I can throw in Rambam (MN 2:30) for good measure, who calls it "how clearly and distinctly this passage explains the subject for those who reflect on it!", and then proceeds to undermine this point with gratuitous(?) reference to meteorology. Yet again, perhaps here also "it was considered necessary to make this one of the most hidden secrets, in order to prevent the multitude from knowing it."