I posted a question. The question was answered, and the question is not in question. The title contained something, which is a tag, that was "organic to the conversational nature of the post". It was edited out. I reverted it back. The person to edit this out has since LOCKED the post so their edit is final.
Is the poster NOT the arbiter of the content of their post?
Why can people edit my posts? How does editing work?
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Effectively, a post is “owned” by the community.† When it comes to what the question is asking it is pragmatic that the poster has final say about that (though we have exceptions even there) because we're here to answer real questions, not what we might wish people would ask. But when it comes to details of the post that amount to site-management, both the rules of the site and pragmatics mean community standards trump the post author.
No, we don't put tags in titles when we can at all help it. “[question] in D&D 3.5e” and “In D&D 3.5e [question]” are both proscribed title formats. As that is a site-management issue, the author wanting to staple the name of the game onto the front of the question doesn't trump community management rules.
As a rule of thumb, if the title can still be a comprehensible title without the game's name in there, it will be edited out. The only exceptions are when it is integrated inextricably into the grammar of the title and removing it is not possible. Since it is trivially removed in this case, it is not organic to the nature of the title.
Keep in mind that anyone on the site can see the tags, and anyone seeing the question on Google will have the most popular tag on the question automatically prepended to the title, and dnd-3.5e - In DnD 3.5 can you see the moon with the spot skill? showing up on Google makes us look like a bag of illiterate gerbils. The only place where no tags are visible either attached to the question nor prepended to the title is in the Hot Network Questions list, but we don't alter our titles to serve that view if it does a disservice to the two normal views (site and external search).
† The legalities are more nuanced. Legally, the community has a non-exclusive, irrevocable, permanent license to the version submitted to and hosted by the community, and has full rights to alter it regardless of the wishes of the author. That's not technically ownership in the legal sense, but for purposes local to the site is effectively ownership in the pedestrian sense. The author retains full rights to their original version, which they can do with as they like elsewhere, as they hold the actual copyright. So in common (not legal) parlance the community “owns” the specific copy of the content hosted here on RPG.se and the community's rules apply fully to it, but RPG.se can't stop the author from using it elsewhere.
Usually yes, we try to respect the OP's content wishes and if there's an edit conflict we tend to let them have their way. That's not an absolute right, but we tend to err on that side in many cases.
Of course in some cases, when editing the content for cause, we do not.
This is admittedly an edge case. It's not something foul or illegal being edited out to where I consider the edit absolutely mandatory, but here on RPG.SE we try to not put game systems in titles, we do not consider that "organic to the conversational nature of the post," see: Should questions include System/Setting in title if tagged with system/setting?. You'll note by looking at the entire front page of posts that we don't do this unless the game name is a direct subject of the post title (e.g. "How do I learn Dungeons & Dragons" doesn't make sense without it, but "How do I double-wield" (with tag) does).
However there's nothing about this that requires having a snit fit on anyone's part, or discussions about deleting or dissociating or licensing or whatnot. We prefer not to put game names in the title when it's an indirect part and rely on tags and/or body, that's pretty simple. It got edited in a routine way for that. For that to get escalated from edit war to locking to meta posts to deletion threats is a sign that someone needs to go take a nap. It's really not a big deal and you should probably look deeper into why you think it is one.
