Live arena failures
Live arena is a lazy, anti player nightmare.
Before the 5 year veterans and credit card warriors chime in, this isn't about "my champions aren't good enough" or lack of individual perseverance. This is about negative player engagement and guaranteed failure loops.
There is no enjoyment to be had for the majority of the player base getting slaughtered in 9/10 Live arena fights because you've been matched against a player nobody could beat with your account. No strategy to learn or realistic outcome besides wasting your time and feeding whales. Easily solvable problem if Live tiers just took longer to advance through. I'd much rather win fights in bronze than lose 9/10 tries in silver to impossible odds. That's the major problem. I don't think most players would mind Live IF the fights were more realistic.
Setting your players up for failure is a really awful business strategy. Again, this is an easily solvable issue that shouldn't get much pushback.