It doesn't much matter what status anyone has, as 99.99999% of the time the doors are going to close when the g/a's are instructed to shut them, PERIOD!
Holding an aircraft anymore for anyone is very, very rare. It's ALL about on time and bonuses!
Like others have posted, you already got more than most people receive. Face the fact that nobody much cares whether YOU make it to YOUR destination on time, it's whether the airplane makes it to its destination ON TIME!!!
I've had the door slammed in my face more times than I care to count, and always, it seems, on the last flight of the evening, when they knew that I was arriving on a delayed flight, through no fault of my own. I've been so out of breath when I get to my gate that it has taken me 15 to 20 minutes before I could even attempt to ask for a room for the night.
Wait until the new UA gets into full swing, and see what one gets for missed connections.