>Golf is essentially a single player game that you play against yourself.
With modern golf, yes. This is only because of the advent of television. Match-play used to dominate the game, and is still advocated my many (myself included), which allows direct competition, and introduces risk-reward strategy depending on how the other player plays.
Are those runners and bicyclists not confused? Taking a risk in golf could save a stroke or cost several; are runners making mistakes like "run harder for a bit but fall into a pond" or "run harder for a bit but exceed limits and take an injury"?
If you don't like a particular thing in golf, then don't use that particular thing. And if it destroys the entertainment value, then don't watch that.
This is very similar to how speedruns for video games have multiple categories with different rulesets, and you pick whichever one you like best.