- Argument AGAINST Wallet: What happens if a fire occurs and your Trezor wallet is damaged? And on the same day there is a "Run on the Bank" and due to some event the price of BTC will fall to 50% of it's value by tomorrow. Liquidity is a concern when you need to make a rapid move.
you are two completely different discussions here.
the price volatility is an entirely different discussion that has nothing to do with wallets and security. if you find it unacceptable then invest smaller amounts or stay away altogether.
as for the first part, the solution is simply keeping multiple backups and storing them encrypted with a strong password and encryption technique. for example you simply encrypt your Trezor's seed phrase with a password that has 10+ length consisting of random upper/lower characters and symbols and numbers. now you just have to remember that password and print the encrypted string and stored it in multiple places so that if your home caught on fire you still have a place to go to and recover your bitcoins.
Well #1 we have to consider is only a certain percentage of funds on Coinbase and some other exchanges are kept in the HOT wallets. So it's possible the thieves only get 1% of your holdings.
hot wallet is different from exchange wallet.
a hot wallet is a wallet that contains small (spending) amount of bitcoin in it and you hold it in a wallet that is connected to the internet. for example a desktop wallet like bitcoin core or electrum that you have on your PC that you use daily, or a mobile wallet on your smart phone.
an exchange wallet is not even a wallet and is not for storing anything. it is an "account" that lets you trade and should not be used for anything else.