I responded to a similar question in more detail from a sibling comment, so I won't repeat it all here, but to briefly summarize: yes, I think he was a great leader, but it's hard for me to tell whether it had much to do with that capability specifically. I certainly don't think it's a requirement for a great leader, but I also think it probably helped at least a little, even if it just ended up being a minor convenience for him and one of many small signals that helped convey that he genuinely cared about trying to do his job well.
I responded to a similar question in more detail from a sibling comment, so I won't repeat it all here, but to briefly summarize: yes, I think he was a great leader, but it's hard for me to tell whether it had much to do with that capability specifically. I certainly don't think it's a requirement for a great leader, but I also think it probably helped at least a little, even if it just ended up being a minor convenience for him and one of many small signals that helped convey that he genuinely cared about trying to do his job well.