Electrum's support for linux is lacking

The 'electrum support' for linux is the same as for windows.
What do you exactly mean?
Electrum runs even better on linux than on windows, or are you talking about the 'support from electrum'. In this case.. there isn't a support at all, because it is not a company.
and there's that whole phishing issue from few months ago
Yes, and it is over.
All the attacker could do is to show a popup with a custom message.
What in your opinion in the best Linux wallet?
I'm not interested in the Bitcoin core since I don't want to wait a whole week to download the whole blockchain.
IMO (if you don't want to use a hardware wallet), electrum.