If you put it in the internet it is not safe. You input it in a USB still not safe even if encrypted one.
I think the key point is to make sure the seed is (and has always been) offline (e.g. piece of paper, offline drive, ...)
Why do you think an offline USB drive is not safe?
I just got two copies that have been written in a paper. One is in my storage of important things and one is being held by my wife which I dont know where she keep it.
If the seed is in plain text I wouldn't be very comfortable with that setup...
The hardware wallet has to be connected to the computer... and the seed has to be displayed/output on the computer so you can write it down doesn't it?
The hardware wallet could have a display that shows you the seed.
If you can't secure a piece of paper with a few words on it, you need to possibly reconsider this hobby.
Can you elaborate on this?