what's the benefits/detriments of Reward-Based Strategies?

Isn't the inherent reward in toileting in the toilet not soiling yourself? Or does this really need to be learned?

I am wondering whether allowing Reward-Based training for my kid just for toileting would help or hurt. My 22 month old does request to go to the bathroom often when he has to poop, so is the problem for misses that he doesn't have the muscle control to hold it sometimes or that he's too emotionally invested in another task or that he actually doesn't care if he goes in the toilet or his diaper?

If it's one of the first two reasons, Reward-Based training (classic psychological conditioning) would introduce a strong shame response whenever he misses. If he's truely not ready to be fully potty trained yet, then I really should not control him with psychological manipulation, right?

Please cite and discuss your best sources. Thank you!