I feel important to note that user will not be able to restore the seed itself.
Why not? ...
Because it's security risk IMO. Same why HW wallets won't show private keys directly and interacts only by singing messages.
Maybe skilled software engineer might be able to get the seed out. But there isn't any simple button "show my seed".
...Hardware wallets need access to your seed to generate private keys, addresses, and sign transactions. That means these seed words (albeit in encrypted format) are stored somewhere inside the hardware wallet. ...
Agree but again, there isn't any simple button "show my seed". Or should not be.
I guess this is the know-how behind the closed source code.
...Moreover, some wallets can display your seed words in plain text if you request them to do that via "advanced options." ...
This I consider a major design flaw exactly because of the case you mentioned after.
Can you tell me which HW wallet allows that?
My assumptions were based on:
Lost your Recovery phrase?
If you lost your Recovery phrase but still remember your PIN code, you can unlock your Ledger device with the PIN code and manage your crypto assets. However, it is highly recommended to quickly send all your crypto assets to temporary accounts and generate a new set of 24 words since the Recovery phrase is the only backup to your crypto assets.
Source:
https://support.ledger.com/hc/en-us/articles/4404382075537-Don-t-have-your-Recovery-phrase-?support=true