So I briefly tried to figure this out myself. My understanding is (still) that if you set up one wallet to hold your crypto, you can probably access the same crypto through other wallets by using your seed phrase, but that some wallets use a different encryption that makes that unlikely.
So to me it seems like a tradeoff between security and accessibility. Either you can worry about someone else getting ahold of your seed phrase and tampering with your crypto, or you can worry about the extra secure product you're using going defunct and not being able to use your seed phrase in a different wallet.