@ROGUE1 agree but being POTUS isn't an everyone job, nor is it a 6 hour per day job.
There are countless anecdotes from former presidents and staff talking about them working for nearly all hours of the day on issues.
The US is the largest, most important economy in the world; the third most populous nation in the world; the third largest geographically in the world; and is currently fighting 2 proxy wars, with a 3rd and a 4th war nearing.
"Good enough" isn't good enough for the top job.