For the source text click/tap here: Sanhedrin 51
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"Rav Naḥman says that Rabba bar Avuh says that Rav says: The halakha in this matter is in accordance with the explanation that Ravin sent in the name of Rabbi Yosei, son of Rabbi Ḥanina. Rav Yosef said in response: Does one issue a halakha for the messianicperiod? Since the destruction of the Temple, courts do not have the authority to adjudicate capital cases (see 52b), and this authority will be restored only once the Temple is rebuilt, in the messianic period. Therefore, what is the purpose of stating the halakha in this matter when it is not currently relevant?”
We explore the use of studying halachic rulings in a theoretical vacuum and the notion of Halacha in Messianic times.