It is not good to hold your coins on exchanges but hold them on a self-hosted wallet. This brings the responsibility of how not to lose your seed phrase because if you lose your seed phrase you will lose your coins.
If there is a natural disaster that flood your town or an earthquake that destroyed the building your seed phrases are, what are the other recovery means that you have in place for you not to lose your bitcoin?
We should backup the seed phrase in a way that no matter what happened, we should still be to have access to the seeds phrase. What are you approaches to make sure that no matter what happened, you will have access to your seed phrase if you are still alive and your brain is functioning properly.
No one is wishing or praying for any natural disaster to happen but since they are natural things so it means it will surely occur and we can not stop it from happening. However, so the best way to save your seed phrase is to save it both online and offline so that should in case there's flood and it affects someone's house the one the person saved online will be safe there but then again saving it online that is in your phone can be somehow because if someone bumped on it they might use it to run ones account dry so wherever one save his or her seed phrase they should be conscious about it.