Well, SE can track that for Trials (and they do for scaling up Echo), but with Trials basically the whole instance resets on wipe. From a technical standpoint, I'm not sure how viably SE can track wipes to a boss in a way that would depenalize leaving. And with the vote abandon option, I'm not sure they would want to.

Also... it's a bit harsh but... vote kick passes more easily than vote abandon, and then you can leave without penalty (as long as you do it before a replacement arrives).