Yes, 191, computers do foist a certain amount of dependency by auto-spell-checking.
Thank heavens for all those "mean" teachers we had in our 1950-1960s schooldays. They who would, casually, toss back an assignment after hitting the second mis-spelled word and guide you to the nearest Webster's Unabridged dictionary.
My heart goes out to today's classroom teachers who are faced with increasing demands for non-instruction paperwork to the detriment of time spent on students. Time constraints no longer allow the "proper" correcting of student writing assignments. [Total disclosure: I walked away from classroom teaching (27-30:1 ratio - 7th/8th grade - Social Studies) when the "administrative" paperwork vs instruction time / student assignment review moved into the 60:40 ratio. I couldn't afford to do my students justice in order to generate the Principals' CYA data for the District/State/Federal paper mill.]
This lack of spelling or composition ability is nothing new. In the 1970-80s, I supervised in a group of c. 25 Archaeologists preparing reports and impact statements. Most all of my comrades were products of California schools & held MA degrees. Few of these Far-Westerners could hold a maple syrup bucket to a New England high schooler. They were, initially, trained in phonic reading programs in California, but never learned (or were held to) proper spelling when the State didn't followup with funding to remediate from their early programs.
Statement:
No one can adequately correct their own copy. You will often read through the silliest errors, incorrect spellings, and poor punctuation in your own writings. The author's mind has a tendency to create an aura that envelops your own product in a cloak of correctness.