My feeling is as long as it's commented, it's OK, I wouldn't fix "isn;t", for instance which happens to be a common typo for me. If say, Tektronix was speed wrong, I'd probably correct that. And I wouldn't fix "Taht" for That if it was the only correction. The primary goal is meaningful subjects and keywords.
If the "reason edited" or the text contained "fixed a few typos"I wouln't care. We don't need titles like "help!, my computer won;t boot". The word "Help!" isn't necessary.
I've pointed out a few typos by EM and they were fixed especially if they are in Sticky's. He's got an image to maintain, and I will help him do it. Notice that EM is more particular about articles and that makes sense.
We do have people where English is their second language, so we might be doing them a favor by helping them learn the language.
Maybe, you should move the relevant posts to "Site issues and feedback"?