I see a ton of MMA fans stating that the reason they don't play these games is because they're unrealistic. I'm not sure if the pool on your channel is the best to choose from. Most people who watch videos of games on youtube are real gamers who know Conor and a few other fighters.
If you went to the MMA subreddit for instance... Basically 100% of them would want more realistic stamina. The MMA subreddit has thousands of active users on it.