The question is, what can be added to Electrum to improve the user experience? Can plugins provide this? At the moment, I've no ideas about which plugins could be developed, besides the existing ones that I didn't find very interesting, I've never needed them.

Maybe something related to additional encryption would be welcome. But I'd only install it for my test wallets or offline environment.

It's all still a beginning, time will tell if it will be a good addition. I usually use some plugins in keepass2, but after that I started using only Keepassxc, which doesn't allow the installation of plugins, but it's very complete.