What am I exactly losing out on by not visiting?
What opportunities do reddit provide for me in comparison of me going swimming tonight?
What are the benefits of an hour worth of scrolling, exhausting myself mentally reading people's comments?
You could be reading about interesting places near you where to go swimming. About swimming techniques. Cool adventure stories related to swimming. Etc.
There are plenty of useful posts and comments. They are also hidden in a sea of shit, just like the rest of the web.
Sure, but such information I could look up the same from some swimming book at the library and find it quicker. The time required to discover those comments are not of worth when I just want to go swimming, I don't swim for anything other than leisure and just paddling about.