Probably has to do with the degradation of written language. With kids using emojis more than words these days our writing is being reduced to a bunch of cymbals.
ich you have adhd and asperger or better, you might end up beeing trained by yourself for ignoring google's, microsoft's or other f'uped up so called "autocorrection" and 'automatically' overlook single mismatching words but recognize the sentence as a whole without actually reading it word by word. some can read entire pages with a single look on it without focusing on a a specific region or i.e. the center while still beeing able to later rephrase the content of the entire page.
Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn’t mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.
I noticed right away, too. But I'm also a guy who frequently sends emails to people whose blog posts have a typo or obvious editing mistake so they can correct them. There are a few who thank me each time. Others might think I'm the most annoying type of person. I just know I hate when I miss a mistake in my own writing.
You can get away with all sorts of shenanigans and have your text still be readable - like removing all the vowels, or scrambling everything except the first and last letter of each word. Worth remembering when you see someone misspell a word they must have seen a million times.
Would probably work better if the word wasn't the first in the sentence. Humans probably use the first half of a sentence in their initial assumptions about what it's likely saying... Probably prioritising the first few the most.