What's the difference between hoarding Bitcoin in a trezor vs hoarding Bitcoin in say, an USB stick and a backup in a harddrive and whatnot? Is it waterprooft?
If you're completely clueless about how to safely manage your btc (like the general population of Joe's), then Trezor is for you. Even if an expert on computer security, trezor is still pretty mobile compared to all the other secure ways of storing/sending transactions.