What people need to pay attention is don't intentionally forget or delete your old wallet seeds, you or someone might unintentionally send coins to your old address.
Yes this is true but we ought to keep the previous keys with cautiousness of were its been stored to avoid others from signing signatures with it and using it maliciously
-Snip-
Though I have not been affected by this but I will stick to this because I recently created a new wallet which I later forgot the password to my amusement and then I just the wallet cleared data on my device and input my seed phrase and thankfully it was a password not passphrase and so I was able to access my wallet.
Then I ask my self this question, imagine if it was a passphrase, then the wallet is gone. I guess others who also forgot their password or passphrase never expected to forget such password /passphrase.
My advice on this would be when you creating a password or passphrase on your wallet or anything relating to finance use something that is really secure and you have use before don't just randomly try something new on them