Re. PBS spacetime
"It's outrageous and probably wrong"
Nice intro.

"rest mass energy was essentially negligible"
The difference between 0 and non-0 mass is effectively infinite in terms of traveling at light speed. Not trivial at all.

"so far no evidence of that, but wouldn't it be cool if [...]"
nice outro



Not sure if that all sounded like pure speculation because it actually is or because of my mood.