Probably my first idea that wasn’t an item or class. Neat!
There has been a minor quality-of-life detail that’s been notably absent in the game for all this time - a notification of when a status effect is about to end. Whether that would be a positive effect on a player or a negative effect on an enemy, there should be a flickering effect over the effect icon about half a second or so before the effect wears off.
I’ve assembled a few rough gifs of what this kind of effect would entail:
Invisibility wearing off
Berserk wearing off
Stasis wearing off
In the interest of fairness, it is possible that such an effect could be distracting and therefore harmful to a player’s experience, so an option to toggle this on or off in the graphics menu could also be implemented.
However, knowing when a crowd of enemies is about to recover from being stunned or paralyzed is important, as is knowing when positive status effects are about to wear out.
This probably isn’t the first suggestion for such an idea, but I haven’t seen it around here, and I would like to know your thoughts on it.
A link to the Reddit thread, if you’re into that sort of thing, I don’t judge
So, yeah.
Edit: So, this is the first idea to reach 1,000 views on this forum, and the third overall! While I’m grateful of this, I would have preferred that such a distinction went into something that took more than 40 minutes of effort to create. Ah, but Ce la vie. 
Edit 2: Okay, someone needs to tell me how and why this become the most highly viewed thread in the entire site.
less deaths because you didn’t know that stun wore off