Like a lot of things it's about reinventing the wheel.
If someone kept the books, then you don't need to reinvent antisepsis or antibiotics, anaethetics etc.
Similarly with maxim system automatic weapons or internal combustion engines.
The issue is far more about resources, material time etc.
So what I think you won't see is the actual 19th century, prescribing lead and opium pills because it seems right. Or blowing themselves up building experimental steam engines.
Rather it'll be KFS producing simple, heavy, reliable and ineficent internal combustion engines by hand. To produce a few cars or armoured vehicles straights out of the 1940s. Or emdees learning how to clean a room in a community and paint it in white emulsion, then disinfect so if they need to operate there's atleast some chance against sepsis.
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