Reminder:
don't use 0.13.9 wallet!
Looks like everyone agreed that it had a security issue, very serious vulnerability with block validation.
It was not recommended to use 0.17.1 before, that does not mean it's insecure itself. Only devs and experts can review the code and can say if it is secure or not. Currently  no dev/expert/coder said that 0.17.1 is insecure.
Why it was not recommended to use 0.17.1 before? Even if the wallet (the code) itself is secure, it could be insecure to use a wallet, if it is on a separate chain, when coins go nowhere, let's say you send coins from a wallet which is on one chain, and exchanges are on another chain, your coins will not come to exchanges in this case.
It is important to have all pools, exchanges, services and users on the same chain. It is important to avoid split of chain/community.
Now we move to one chain, it is necessary to stop using other wallets and update your wallet to 0.17.1.