One of the thing I hate the most as a DM is tracking ability score damages for monsters. Change a characteristic and the change impacts everything (Attack bonus, AC, Saves, HP, Skills...).
It might be easy for a player to track ability damage but as a DM it quickly becomes a pain when you are running an encounter with 4-5 monsters. Having to recalculate all the above in the heat of combat requires a significant book keeping that I would gladly get rid.
I would like to explore in this thread any alternative mechanism you may have come up to replace ability score damage and make the DM work easier.