Don't forget that everything can be hacked. Once it somebody created, there would be someone who would be able to hack it, I am sure. So it is like a bank, it would be stupid to put all your savements in one place and hope that it's 100% secure and nobody would touch it except you. I recommend you to use both offline and online wallets.
Am I considered as stupid even this one place hold my bitcoins offline and not online and if hacked, the hacker cannot find nothing or only few satoshi? Or even if this place will replace my bitcoins if those "were lost or stolen as a result of a breach of the physical security, cyber security, or as a result of employee theft" of the this place (which is an online wallet)?
I don't think so. If I store my bitcoins in this kind of place (even it is ONE place and not more than ONE) I consider myself very smart.