TechTakes

MSDS is a multi-page document that is mostly filled with boilerplate, but you could expect some more detailed precautions and instructions, like for example in case of HF burn apply calcium gluconate cream, use special glass for diazomethane because it can explode in contact with ground glass surface, pay special attention around whatever-class of compounds because these are potent sensitizers, or such. most of the time it's not there, because people that write it never used these compounds, and people that do don't read that and don't need reminder after that detailed advice propagated to them via what is basically folk tales from labmates. it's more useful to have a comprehensive chemical engineering handbook or similar resource (as searchable pdf) that has listed dangers for common dangerous reagents

from that second link upthread:

Experienced chemists know to go to sources like Sax's or Bretherick's for more useful advice, and tend to ignore safety data sheets entirely. But they're not really made for experienced chemists (nor, apparently, by them either). For more general users, you would want these things to do some good, or at least do no harm, but the idea of a safety data sheet that actually makes its readers less safe is really unacceptable.