One or two errors out of 1000 or more words - that would be fine.
What we see, routinely, is failure to proofread and (more time consuming for unpaid editors to handle) the need to *teach * basic grammar, syntax, and puctuation in dialogue. I'm ever amazed at how many errors show up. As for Stephen King, a lot of editors *would * reject a lot of his stories. Once established, writers get away with a lot more than unknown writers do. King's latest, co-authored with his son, has some pretty harsh reviews. Anyway, if SFT's criteria sound too daunting, try reading some of the work that's already been curated. We know there is always room for improvement. Also, we offer a Workshop (free!) to help with the formatting, grammar, syntax, and spelling issues. Ignore it at your own risk. Thank you for reading and commenting, and please know it is not our goal to scare people off with impossibly high standards.