I am not savvy in these things. I am just trying to integrate myself by learning as I could. I want to know how vulnerable we are, that we are afraid to type with our own gadgets. Having the Idea that someone is reading the keys I stroke or recording my screen is making me so uncomfortable and scared.
If your computer is infected with malware, yes it may be vulnerable. That's why it's recommended to always save the seed offline, preferably in physical format.
Now if your PC, where you have to open your wallet, is a clean and secure system, there is no problem. In the end, everything will depend on your behavior when using your computer.
But this tool can be useful in an extreme scenario where you feel the need to open your wallet in a less viable system. Scripting can help minimize the dangers. You don't eliminate them, but you can minimize them.