Why are you sure that using Electrum on Linux is safe? Do you know the meaning of the expression monkey with a grenade?
Linux is safe as an operating system as compared to Windows OS, and that's why it's recommend by tech experts and is used in most datacenters. I won't go deep but open-source software or operating systems are more safe as compared to closed-source ones.
You can just as easily expose yourself to a virus by copying the wrong command into the terminal and being exposed to a virus.
I believe what you have said is true, but most Linux users are technically good and they avoid copying and pasting of wrong commands in terminal.
On the other side, I am a Linux lover and very careful when handling it, but even as an amateur, not a professional, installing an electrum wallet from Appimage seems to me to be one of the simplest things.
It's good to know that you're a Linux lover, but I don't agree that installing electrum wallet on Linux is that simple. I know if someone has technical expertise then for that person it isn't a hard task but for an armature with no technical knowledge won't be able to do that easily. On the other hand installing or running portable version of Electrum on Windows OS can be done easily by someone with no technical skills.