There are multiple levels to this. One is her attacks on the current orthodoxy around arguments that invoke causality or Special Relativity (as opposed to General Relativity). The arguments seem sound, and I’m sure it will hurt egos and generate controversy (a specialty of this particular blogger/youtuber).

The second is that it reframes the speed of light limit as a “barrier”, and more clearly defines why accelerating mass to the speed of light is impossible (while explaining what mass actually is).

It doesn’t give the answer of “well you just need to do this”, but by removing artificial constraints “causality says no”, it will hopefully allow more young smart people to get interested in studying more in this area.

I strongly applaud Sabine in her attempts to demystify General Relativity and Quantum Mechanics (across other videos). We should introduce these (particularly Quantum Mechanics) into the later school curriculum. It’s a shame that the majority of people never get to study this, as it’s so fundamental to our current knowledge of physics.