It's proverbial that engineers are bad spellers. There is a street on the campus of Georgia Tech named Ferst Street. The joke is that it's first street, but misspelled. Like most engineering jokes, it's not funny, but does make a point.
There was a study recently (I can't find the link), but it asserted that part of intelligence is the ability to remember things that are important. Good memory is less important than distinguishing what to remember.
So..... since you can always look up words, or use spell check, there's not much use in remembering how to spell words.