Yesterday I lost 11 BTC from my Bitcoin Core 25.0 wallet. The wallet wasn't open at the time. I don't know how it happened. Lots of emotions right now.
I am sorry for your loss, be it story or reality. But I want to ask you why you put 11 BTC in a careless wallet. 11BTC means huge amounts of money. Why don't you put a strong hardware wallet offline? People will learn from your loss but your loss will never be recovered. Your wife may not have done such a thing. You may have given your wallet seed phase somewhere.
OP made a costly mistake by putting such an amount of Bitcoin in such a wallet and you are right that he should have got a good hardware wallet. But he didn't put his coin in a careless wallet, if you read the original post it will be clear which wallet had the coins. Bitcoin Core 25.0 wallet is a full-node wallet and is considered to be one of the safest wallets. Its ability to download and validate the entire Bitcoin blockchain makes it one of the most difficult wallets to attack. It is also an open-source wallet which means that everyone have access to see, make comment, or propose a change to the code.This fact has made members doubt the story and want him to sign a message.
But splitting his coins into different wallets would have been ideal if he was using a software wallet. If I were him I would have shared my coin into a different trusted wallet or better still buy a hardware wallet. It is far cheaper than losing such an amount. However some persons might be scared of ordering a hardware wallet because of the high rate of criminal activities. People are afraid of ordering fake wallets or compromised wallets. Even if they order from the right source, delivery services in some countries cannot be trusted. In a country where cybercrime is high some delivery service staff can change the wallet or compromise the hardware wallet to steal the coin.