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Well yes and no. You should read on cold vs hot wallets. You’re not buying the Ledger for your seed phrase. You’re buying it in theory to have a device where your private keys reside and for those to never have youched the internet. Your coins live on the Blockchain always. As soon as you enter your seed online, the advantages of having private keys never having been compromised online, having the ability to authorize transaction without compromising your seed using the physical device is why you get a Ledger.
Let’s say you have an online wallet (hot) and that wallet is compromised or your computer is hacked. Well having your wallet, they can now empty your funds no questions asked because they’ll own your seed.
If you have a Ledger and someone hacks your computer, steals all your password. Your seed has never touched the internet and your funds are safe. If you lose your Ledger, you can restore the seed on a new Ledger and you’re still all set.
Hope this helps clarify, but if you can, for security reasons, you are much safer using a hardware wallet as opposed to an online wallet.