The answer to why we didn’t develop pretty much any given technology sooner has nothing to do with ignorance or fear but rather the market price of labor.
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Tabula Candida 
There was a TV programme about building a Roman villa using traditional methods & materials. They had a big argument caused by the lack of slave labour which meant that they were forced to (covertly) use wheelbarrows, which the Romans didn’t seem to have invented. http://www.thehistoryblog.com/archives/9880
Just like that!
I love your little comics! I think they attract attention and describe issues at hand perfectly!