The talk intended here is what is permissible at other times, and it is the same to engage in it or not. As for prohibited or disliked talk at other times, it is more strictly prohibited or disliked at this time. However, if the talk is for a good purpose, like learning, speaking about righteous people and noble morals, and speaking with a guest or someone needing something, then it is not disliked; rather, it is recommended. Likewise, it is not disliked to engage in talk for some excuse or casual reason. The views I have just mentioned are supported by authentic Hadīths.
1746/1 - Abu Barzah (may Allah be pleased with him) reported: “The Prophet (may Allah’s peace and blessings be upon him) disliked sleep before the ‘Ishā’ prayer and talk after it.” [Narrated by Al-Bukhāri and Muslim]
1) It is disliked for a person to sleep before the ‘Ishā’ prayer, fearing the elapse of its time.
2) It is disliked to engage in talk after the ‘Ishā’ prayer, unless it serves a good purpose, lest a person should delay his sleep and miss the voluntary night prayer and the Fajr prayer.
1747/2 - Ibn ‘Umar (may Allah be pleased with him and his father) reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) led them in ‘Ishā’ prayer during the last days of his life, and after finishing it, he said: “Do you see this night? Nobody present on the surface of the earth tonight will be living after one hundred years.” [Narrated by Al-Bukhāri and Muslim]
1) It is permissible to engage in talk after the ‘Ishā’ prayer about knowledge and the interests of Muslims. Falling under this is the talk with one’s guest and spouse or for the purpose of fulfilling the needs of Muslims.
2) This Hadīth is one of the signs proving the Prophet’s prophethood. He told the Companions about something that would occur in the future, and it did actually happen. Scholars stated that the last surviving Companion, Abu al-Tufayl ‘Āmir ibn Wāthilah, died in 110 AH.
1748/3 - Anas (may Allah be pleased with him) reported that they waited for the Prophet (may Allah’s peace and blessings be upon him), and he came out around the middle of the night and led them in prayer, i.e. the ‘Ishā’ prayer. Then, he talked to them and said: “Indeed, people have prayed and slept, and you remain in prayer as long as you are waiting for prayer.” [Narrated by Al-Bukhāri]
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1) It is recommended to delay the ‘Ishā’ prayer sometimes, unless it is difficult for people praying in congregation in the mosque.
2) It shows the bounty of Allah Almighty towards His servants, as He gives them reward as long as they are waiting for performing an act of worship.