Zelcore allows using 2FA on its wallet, it's just that this wallet is complicated to use for a newbie but pretty secured, I use this wallet to store my Flux coins.
Zelcore and security don't go hand in hand. The private key is not generated randomly. You create a username and a password, and the private key is based on that entropy. There is a good explanation of how it works in the posts in this thread >
https://bitcointalk.org/index.php?topic=5035274.0.
2FA is very important because sometimes I show my login password gotten anyone and he login in website, specifically when I save my password in Google chrome it’s Somehow password Lick so 2FA is best way to saved account.
You shouldn't give your passwords to anyone or log in using unknown devices. You should also not save your passwords in Chrome and other browsers because password-stealing malware know how to access these locations and got hold of the data.