Moksha, Nirvana, and Liberation make no sense

I never liked the concept of detachment, and the philosophies of moksha, nirvana, and liberation make no sense to me. Shrimad Bhagavat Geeta originally consists of 84 verses. The original principles are Dharma, Artha and Kama. Someone or some people decided to add moksha. So, the idea that all desires lead to misery and are pointless just live a desireless life and aim for dissolvement or merger with the divine, sounds like a tool to discourage people from having any ambition. Freedom here is actually freedom from karma, not the end of existence.

Then why is anything created? Oh well, it's Lila, just an illusion, just divine play. Come do tasks without detachment and vanish into nothingness. It sounds so disheartening. When God Vishnu, in the avatar of Raam, showed human emotions of love, pain, and misery of having his wife abducted, he did not live a detached life; he fought to rescue his wife. He showed anger, too. In the modern day, loving and depending on someone for your happiness is considered attachment, and it is given other labels. As is even in marriage, people are supposed to have distance, space, and individuality, so what is the point of marrying someone?

History has shown that courage and willpower are required for the fulfilment of most, if not all, desires. If everyone leaves detached life, then all would isolate and meditate without doing anything, saying oh well, it’s just pointless, let's aim for liberation and vanish. The soul being eternal is shown in the Geeta by God Krishna. Vaikunth the enternal Loka exists. O Arjuna, there was not a time when you, I, and all these people did not exist, nor will any of us cease to exist in future. Savitri literally bought her husband back from death from Dharmraaj. Devotional love is respected by the goddesses and gods.