As I've mentioned in a comment
If the title is enough to understand what game is being asked about, then it doesn't need the game. If the title is broad enough, adding the game means the same question can be asked about a different game, and it's easier to know which game the question is applied to in any case where only the title is shown. For example, in the "related questions" sidebar, or the "similar questions" that appear when composing a question.
When browsing the Arqade homepage or several other lists of questions, the titles are shown with all associated tags below. But when asking a question, the user is shown a list of titles without tags, which can be very confusing if no context is given, as shown here. The "Linked questions", "Related questions" and Hot Network Questions lists all show titles by themselves, so purposefully removing context from these questions is doing a disservice to the community whenever a question appears on one of these lists.
As for the third question? Personally, I didn't notice. But that's the nice thing about Arqade, everyone can and is incouraged improve posts whenever they see something that could be fixed.
So, if I'm asking about which shouts to use against Alduin, that doesn't need the game in the title. But if I'm asking about the best way to hide a body? Yeah, it's helpful.