I don't know if any further action has happened as a result of this thread yet, but I'm going to give my two cents as somebody who's been an editor on various Wikia wikis (Wikia being the original name for FANDOM) for almost a decade now and has a particular interest in policy formation. Feel free to ignore if you want, but I do have experience.
First off, I have never seen a wiki before that hands out blocks for grammatical errors. Blocking people making mistakes while making good faith edits goes against, well, it goes against "assume good faith", which is not only the golden rule of wiki editing in general but is also your first listed policy. It's also a great way to scare off potential new contributors, never transitioning them from newbie to an integral part of the community.
The best way I know of to enforce a manual of style when it comes to a new user is, at the beginning, just to fix the mistakes and move on. It's honestly just not a big deal. It's way harder to write content than it is to fix grammar, so accept people who are willing to write/correct content with open arms! If they stick around for more than a few days, then it might be worth messaging to say "hey, thanks for adding so much good stuff! Just FYI, we've got a Manual of Style that we follow on this wiki to make sure our writing is consistent. It'd be great if you could have a look at it, especially the part about <insert thing they did wrong here>. Anyway, thanks for contributing. Hope to see you around ?"
You will also find new editors who take great joy in fixing those MoS errors, and they'll help balance out the poorly styled yet informative content.
Also, when it comes to advertising block lengths or what it takes to get blocked, here's some free advice earned through years of pain: don't. Just... don't. One thing trolls love to do is to break the spirit of a rule while sticking to the letter of the law. The more specificity you have around punishment, the more they can say "well I didn't do <specific thing that was banned>. I just did <bad thing that wasn't laid out in the rules>." Meanwhile, good-faith but unaware actors will get caught up and punished by the rules designed to target bad-faith actors. This is one area where it's best left up to admin discretion, assuming you trust your admins and elected them to those positions for a reason. Then the intent of the editor can be used to set the punishment, so trolls get locked out whereas new users who make mistakes can be guided amicably to a better way of working instead.
I still remember the first edit I made on the wiki that would go on to be my home wiki for years until it was finally decommissioned last year because of platform deprecation reasons. Or, well, I don't remember the edits themselves, but I do remember the message I received about them. A more experienced user on the wiki a) recognised that I had made my edits in good faith, b) pointed out what went wrong, c) told me how I could fix the mistake, He drew me into the community by teaching me the ways of the land, not by threatening me with punishment for making a mistake. That was 8 years ago, yet I still remember the feeling of receiving that message to this day. That is how you build community. That is how you grow. Not by threatening punishment, but by bringing new users along for the ride.
I do have more to say, but I think that's enough in one go. Good luck with the policy update! I'm sure you'll do well ?
Edit: Arg the editor here doesn't accept wikitext! *shakes fist*
