Jimmy Song explains everything .
In the specific case of Monero. Monero can't scale at the the Bitcoin level, the transaction size is too huge. The value of Bitcoin is a consequence of the scarcity of Bitcoin. Monero was found to be too buggy, and too experimental to be taken seriously on the scarcity side. If you look at the exchanges, you will find out, that nobody uses Monero.
ASIC resistance is absurd. If you know the Altcoins world, this is where the scammers thrive. As explained by Jimmy Song everything is centralized in the Altcoins space. You will find out, if you look closely that ASIC mining exist there, but they are not available in the free market, they are a privilege of the people controlling the coin (the scammers), at the expense of the newcomers.
As Jimmy Song explained, the technological argument is pure marketing. In the open source world, you will give time, and you will not expect a direct economic advantage.