What if you were homeless, digital nomad, or rent distressed? You gonna carry around your seed phrase in your wallet?
If you are homeless, there is a high chance that you do not have any money, and that includes BTC. You'd not have money either in your bank account or in your wallet address and be homeless.
Also, when I say "long term", I don't mean holding bitcoin for the apocalypse. Long-term = 1 year or more. I just want to invest and get the big returns. Moving it to an exchange is my goal so I can day trade and multiply those returns, which you can't do on PP.
At the end of the day it is your call to make, we can only recommend what is safest for you to do, but it is your money, so yeah.