I disagree because Electrum 2FA makes a 2-of-3 multisig. This will prevent you from getting robbed if just one device is stolen, but if all of them are taken? Then your funds are screwed.
If you are OK with placing Electrum on many devices, I guess there's no problem with that as long as you move your funds quickly, but this guide is more oriented to using Electrum on a single device, without additional peripherals (hence why LiveUSB is not included cc. @LoyceV)
If your 2 devices are stolen, the robber will still need to know the PIN code of your smartphone, the password of your computer, and the one of your Electrum wallet, because using the 2FA feature don't prevent people to also using a "strong password" for their wallet. So it wouldn't be so simple.
You're right about bare seed phrases being handled as little as possible, and frankly that's how it should be treated. As seed phrases with bitcoin on them are more like physical assets, such as gold or a stack of cash, you should be moving it around as little as possible.
Yes I agree with you but personally, I'm not confortable with having one single backup of my seed, even if I carved it in stone.
Not only is that bad for privacy, it's easy to mess up writing it and if you do it electronically, you could get robbed by specialists inspecting the peripheral's NVRAM.
So, this is not risky unless you are holding a large amount into this address.
I don't think there's a way to determine the safest server, with the exception of the one hosted on electrum.org. You're basically trusting the node operator to not leak your privacy.
A private electrum server is much better than a public one for this reason, maybe I'll add that. It does require a connection to a bitcoin full node though - usually you have to run those yourself. Or maybe Getblock will do provided that wallet RPCs are not used (they are disabled over there).
Running a full node is not an acceptable solution for a random user, and Bitcoin is supposed to be safely usable by everyone.
There is neither any reputed SOCKS 4/5 proxies?