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If BTC is bullish, your goal is to make higher gains than it, therefore why comparing with bitcoin.

Because virtually every alt is traded against btc not against the USD. People use this to hide when Alts have dropped. If btc goes up by 10% and Alt A goes up by 5% against the USS it looks bullish, but in reality it is btc pulling up Alt A and Alt A has actually lost value against btc.
Just holding the btc is always an option (and usually the better option) so comparison with btc makes much more sense.

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