isn't SW a point to point operation
More like a point to point to point to point to point operation. It's one of life's great mysteries why SW has so many multi-stop flights. It would be different if they were stops along some kind of sensible route, like bus stops, or the old days of a LAX-SFO flight (in a DC3) that would stop at a handful of airports along the way. But they operate things like SNA-SJC-LAS - nobody in their right mind would fly from SNA to LAS via SJC, when there are dozens of direct flights a day. It also leads to the odd phenomenon (in my personal experience) of having two flights in the air with the same flight number, when an earlier sector gets delayed and they put on a substitute aircraft.