i already transfered my funds to a different wallet
wiped the trezor memory
set up the trezor all over again and wrote down the 12 words seed, is that right ?...
Sounds good. You can also do the
dry-run recovery to see if you have written down your seed correctly.
correct ?. does it serve any other purposed if my wallet is lost or stolen ?
You should read about
this Trezor exploit. If you are worried about any physical attacks then you should use a long passphrase.