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.
In the menu of your Electrum client if you click on the Tools > Plugins you will see a list of the plugins that can be installed with a ? in front that explains what they do (From version 4.5.5). Some of them look interesting even though I've never used any of them either; like the LabelSync one for those who want a backup of their labels and a way to recover it again in another wallet, and there are some who want this.
