What do you think about this? Before hacker can have access to something, that means the vault is online. If something is online, it can be hacked. If a password manager is not offline, do not use it. I like to put my seed phrase on a paper, if you want it safer, you can use a steel backup for it, there are steels that you can buy to backup your seed phrase and it is not a waste of money.
LastPass is password manager and this has nothing to do with bitcoin seed phrases.
I would never suggest saving seed words on any password manager it doens't matter if its' online of offline, just use piece of paper or stainless steel washers/plate.
Similar thing is when you hear words like ''cloud'' you should know that is not really safe because it's just someone else computer drive that is online.
Great open source alternative for LastPass is called KeePass that works offline and it can be used for storing passwords, 2fa and other information.