It is right. Private keys are too important, and losing it will really  cause you a big trouble.
 Unlike other accounts or wallet, some  wallet used passwords instead of private keys and it is recoverable once you forget it but passwords has a possibility to cracked or hacked by hackers thats why it is still risky. But using private keys, even you cannot recover it once you lose it. It is really secured. It only depends on you if you take care of your private keys you wont lose it. Just like mine, i save my private keys in my phone's secret vault and also by having its backup in my google drive. Cool.