Are you arguing that Krissalla should have know more physics? I am not sure what your argument is, here.
Also you miss the fact that the Physics of the scholars at Silverlight has a hard limit with our world's physics.(And an even lower limit at Sanderson's understanding of it) Sanderson cannot go past it, no matter how much in-universe time passes. The main research of Silverlight would indubitably be about Investiture and Realmatic Theory.