Why YSK?
The first person who typed “should of” probably heard of it in real life that was meant to be “should’ve”, they typed “should of” online and readers thought that it’s grammatically correct to say “should of” which is in fact wrong and it became widespread throughout the years on Reddit.
I hope something could start to change.
English spelling errors are common because English is not written phonetically. If you fix that, you reduce the errors, not increase them. Spelling mistakes would still occur to some degree (ultimately because one dialect’s pronunciation must be chosen for the written standard) but it would still be an improvement.
Imagine if anglophone students could learn to read and write in 2 years like their peers in Spanish and German speaking countries (many dozens of others) instead of 10.
You’re forgetting the transition period where we change a standard ppl are used to, and also that it’ll be impossible to make orthography match phonics bc different accents and dialectes of english all pronounce things differently
Edit: and also I think Spanish and German speaking counties probably just have better education systems