MSDS is just a small part of process safety. CSB deals with the very largest industrial accidents. These are at plants where millions of pounds of chemical flow through any pipe every day.
The examples you mention about MSDS sounds relevant to a large building/warehouse, but we’re talking about massive industrial complexes nearly equal to the area encompassing all of Seattle+Bellevue+Redmond+Renton+Tukwila.
At that scale, there are still plenty of surprises. Like, “oh shit, I didn’t realize the new version of the lubricating oil the manufacturer recommends for our massive pumps have a different additive that reacts with an impurity in our process stream which catalyzes an exothermic reaction”.
I highly recommend a very short book named “What Went Wrong” by Trevor Kletz. It’s surprisingly entertaining and walks you through basic things that have caused disasters at countless chemical plants over and over again.
I think if the goal is to “de-regulate”, there are other agencies that could be shut down instead. CSB provides all companies with the know-how to choose to prevent giant disasters. Shutting down this agency may be motivated by a desire to reduce regulation but it’s really counterproductive.
Someone who is against regulation might still support the work of CSB because it assists the operations of any de-regulated industries.