Exactly, no one is an expert in this journey of crypto, no matter how careful one is, one will one way or the way will always make mistakes that give them another experience or teach them more about crypto and this will make them to strategize their plans.
No body is entirely 100% a security guru until they are attacked and notice that they have a loophole they need to cover, but some have been able to upgrade and cover their little mistakes by just being very careful and taking corrections from those who fall victim to hacks and exploits. As days go by, that’s how we will have to expand our knowledge on security and make sure that we are not left behind; even the most once-known secured devices are now discovered to have security issues that raise concern.