Because they would have to go through 2 layers of security right? Also isn't it true if someone logs into your gmail account from another location, gmail would block them if they don't recognize the ip address or country etc? So wouldn't that be another hurdle for that hacker? And even if they get through that, how could they hack the password for lastpass or keepass then? Are there cases of this? Because i have heard of cases where someone types their seed and emails it to their gmail account like in plain letters... that is bad since its not even encrypted. But with lastpass or keepass, isn't that pretty safe then?
The thing is shouldn't you always have a digital backup? Because in case something happens physically to your items?
I do not know why you ever think about it,private key or seed should never be stored in e-mail account no matter how this email is protected.When you get your seed from hardware device or desktop wallet write it down on a piece of paper and make several copies.Since paper is it is not fire and water resistant and ink can blur with time it would not be bad to engrave seed in piece of metal or plastic.
Just for info,Gmail will not block hacker or you to access to your e-mail form different IP address,they will only send you warning that someone is try to log in from different device/IP, something like a warning to a suspicious activity.
The whole point which makes Nano Ledger so much more safe than a password protected wallet on your computer is that by storing your Ledgeryour seed offline even in the case of hackers intruding in your computer they cannot get your private key. But if you store the seed on your computer, all safety is gone.