Having readily accessible cash (rather than BtC) is so important and 3-month is a good amount. The tax implications around selling BTC (as mentioned in the OP) are pretty debilitating and outweigh any opportunity cost fears.
I think that depends on the tax system. We have a bad CGT deal in the UK, but it only applies if the BTC has appreciated in value and outperformed cash.
I think the real killer is if the price crabs for a couple years, but you're flip-flopping between exchanges and taking a ~1% haircut with each transaction.
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