Why is this always the default?

Why do manufacturers or programmers assume people want the most annoying setting on text programmes? Every single time, in Word, on phones, on Kindles, inputting text leads to a fight between what I want to write and what the programme insists on inserting. Then I have to track down the corresponding setting and turn it off in order to regain control over what the text actually says.

I was leaving a comment on a Hobbit fic on Ao3 and mentioned Nori. The keyboard didn't like that at all. Nori? Obviously a mistake! I obviously wanted the word 'Both'! In another comment, on Reddit this time, mom was obviously min. Gah!

I know what I'm typing! Stop fixing my words! Grrrr!

Technology, I tell ya. This is how the war between mankind and machines will start...with FU Autocorrect.