the very slow confirmation sucks. Moving your bitcoin from a wallet to an exchange to catch and profit from the downtrend takes forever and misses the timing 100%. Leaving your fiat in an exchange for an extended period of time make me awake at night. So much profit opportinities provided by cryto but the infrastructure sucks. Had to wait for several hours just for Coinbase to confirm my transfers. Coinbase is one of the most user friendly but highly unrealiable.