Hey there @raoanwar178. This has been something requested and is always “on the table” for discussion. That said, the current belief is that it would present too much of a security risk to privacy. There have been instances, even recently, of data breaches within big companies that retain this data. You can see where I have shared links of examples in a post at When Will There Be A Master Password? - #61 by Saoiray
I understand the convenience you’re requesting, but Brave is prioritizing privacy over convenience.
As to what @SmartyAadi mentioned, I wish he’d reconsider saying it that way. It’s been important that we stress that Sync is not a backup. There will come a time that even that 25th word won’t help you get things. So presenting that is a plausible idea can be misleading and give a false sense of security.
You should do occasional backups then. You can export passwords, bookmarks, and other information to a flash drive or somewhere that you keep safe. Otherwise if you have multiple devices, you can use Sync. Most of us have a phone and computer. The chances of both of those things getting stuff deleted or lost is slim. So long as you have one, then you’ll likely have all of your information because you can always add devices to the sync chain again.
If that’s not good enough, then there are always password manager extensions you can use which will keep your info into an account you can access via username and password. You’ll just have to keep in mind that those aren’t as safe. So it’s all up to you.