Questions about theoretical issues about psak and general halacha concepts
halachah-theory is for questions about theoretical issues about psak and general halacha concepts.
Questions about a particular line of reasoning and the path from concept to rule in a Talmudic-style discussion would more likely fall under the similar lomdus.
Questions relating to overall Halachic constructs and concepts (eg., Limits to Dina Dmalchusa Dina) fit under this tag.