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The diversification argument is flawed and does not apply here. Every alt you stack will eventually lose value against bitcoin. This is a fact. Just look at the price curve denominated in bitcoin.
I participated in an ICO in 2017/8 and bought 6000 XTZ with 1 btc. No matter how much the price of XTZ increased in USD, it never surpassed 1btc, but actually lost ~90% of its value in BTC!
It's the value in BTC that matters, because it's sound money, not in fiat, a currency that governments can print indefinitely. The data is clear.