A lot of Paul Graham and Joel Spolsky posts don't get straight to the point and usually do not follow an intro -> body -> conclusion format. A lot of them start with a story that makes the direction of the post unclear[0] or include long digressions whose value isn't immediately obvious.[1]
For a while, I struggled with this contradiction because I think good writing should quickly demonstrate the value a reader can expect, but I think Graham and Spolsky are excellent writers that frequently take their time in getting to their point.
The easy answer is that Graham and Spolsky are famous, so they can do whatever they want, and people will still read. I've come to think it's actually that writers like Graham and Spolsky are so good that the quality of the writing itself is the thing of value that keeps you interested even if you don't know what point they're going to make.
[0] https://www.joelonsoftware.com/2000/04/06/things-you-should-...