Sometimes the regret is about making losses, but the important thing is to keep to stop loss and TP. Not to dream and never realize p/l. Easy to forget for most traders that they came and traded using strategy to make consistent gains, not to make X amount of money.
Hence I think unrealized profit is not the case for bitcoin, even if you are a trader you could say that 100 bucks in bitcoin is still 100 bucks and it still worths something, it is not digital fake numbers, it is bitcoin and it does have a purchasing power. What you said could be very well true in any other asset, barely anyone accepts gold or silver as payment, you may convince them but you can't do that easily, definitely not online, nobody accepts shares, or foreign currencies that easily, but bitcoin is different.