Haven't been one of those for about fifty years. Even in my day at school, they used slide rules. Been a very long time since serious engineering was done without arithmetic hardware of some sort.
I once asked a high school teacher that I admired whether it would be good idea to get into engineering at Uni. His reply was, to paraphrase, "..sure, go for it, if you want to spend the rest of your professional career in a closet wearing out slide rules." I went into biology instead.