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.
I remember ChipMixer releasing a plugin for Electrum many ages ago, which they eventually discontinued. Probably one of the reasons was the difficulty to install it, they even tried to get it merged to Electrum, but no luck because of the nature of their business.
Small update here.
We have created ChipMixer plugin for Electrum. It allows you to tumble your bitcoins with us without leaving your wallet and it is even easier to use than website (prefill forms, creates new wallet and imports private keys for you).
You can check readme and screenshots here:
https://github.com/chipmixer/electrum/tree/plugin/plugins/chipmixerPull request is pending, maybe it will get included in next version of Electrum.