One big problem about commit messages is, that you write them from your perspective. If you write them while activly engaged with the topic and changes you are very heavily biased and might miss things which are obvious to you but not to future readers with less knowledge. I think abstracting your personal opinion is quite hard - I agree that LLMs are perfectly fitting for writing this since they just dont have a "personal opinion". Atleast I made the mistake in the past many times focusing on the things which were not obvious to me but then leaving out the non obvious things for others.