2. All the "not your keys, not your coins" mindless chanting misses the point. While true, a modern financial system depends on being able to have trust in financial institutions if you actually need to move money quickly. Years ago I went the "move everything to cold storage" route, and it was a major pain in the ass, not to mention slow and expensive every time you needed to move to an exchange to trade or convert to fiat. It's the equivalent of stuffing your money under your mattress - valid for emergency situations, but not for a currency you actually want to transact in.

Oh, and the reason hardly anyone actually stuffs money under their mattress any more is that we've built up institutions (e.g. FDIC insurance, SIPC insurance, and the associated regulations to provide this insurance) to reliably protect depositors.