if we are not talking concepts or ways of doing things or such and stick to just actually physically made products that are mass produced and widely bought. I thought I was going somewhere but so much stuff is concepts. If you don't have gunpowder there are all sorts of other explosives and not have cars does not necessarily mention not having engines and if you do an engine type then you just have it all under a different engine type. Going to one specific thing I think would not really do anything but make a kind of knowledge hole because something that is ultimately going to be obvious is just not done for some magical reason. Honestly it all comes down to regulation and laws and such. I mean the amish don't have to deal with cars and smartphones even though they exist. Its really on us to use things or not use them responsibly.