How does holding an asset during a decline in its real purchasing power terms by 70% represent having a 'strong' hand?
All it represents is losing money.
A 'clever' hand would have sold up at the beginning of the year, and would now be buying up BTC.
A 'clever' hand would have three times more BTC than a 'strong' hand.
Three times!
Do you mean 'strong' as in 'dense'?
Strong as in have money to live on to be able to afford not to gamble. Strong as in does not care much about immediate prices, has many years long outlook, considers everything smaller as noise.
PS Granted, I'm not strong enough myself since I sell a little at peaks and buy at bottoms, but the ultimate goal is to reduce that gambling percentage of holdings to zero. I now gamble with about 20%. More may be acceptable if you don't have much. Selling all then buying all seems plain crazy to me. It can maximize profit, sure; it can also lead to losing all, as in: exchange goes away, exchange ratio goes against you several times, moving large amounts of coins you attract unwanted attention and get hacked, etc.
I hope you now do understand a little better, what is, actually, clever. Gambling is fun, but far from clever.
As for weak hands, these are hands which sell or buy on emotion, while being scared or greedy. They always lose.