Moreover I don’t get why it is a must to set it up when creating a wallet.
This was what I was complaining about before if I leave the passphrase empty while setting up the wallet:
The frustration (image above) did not occur when I added the passphrase (wallet 1).
I uninstalled the wallet and installed it back. It has a default backup directory and all the wallet I created was seen after I installed back the wallet.
Wallet 1, has the passphrase
Wallet 2, did not have the passphrase as I omitted it (wallet 1 seed phrase without passphrase)
Wallet 3, new wallet seed phrase with no passphrase added.
After I opened the wallet after I reinstall the wallet
Wallet 1 that has the passphrase, displayed the frustration downloading and processing network date (above image). When I first set it up, there was nothing like that.
Wallet 2 also displayed the image above as usual
Wallet 3 surprisingly did not displayed the image, although which was the first that I opened without data network on after I reinstalled the wallet. I on the data and it synchronized.
I confirmed wallet 3 on incoleman BIP39 tool and it was correct (and without passphrase).
So this leaves me with the conclusion that you can use the wallet without the passphrase. I mean if you omit to use passphrase and not include it while setting up the wallet.
But the wallet was frustrating for me as that downloading and processing takes a longer time.
After more than 30 minutes, wallet 2 without passphrase is also working now.