I hope to never fly SW, and now want to fly them even less. Any incentive I had is gone as I usually buy tickets last minute, and even if I book the higher fare if the early boarding is assigned by fare class combined with date of purchase, I wouldn't be that high on the list. I wouldn't be able to control my destiny.
While this was done to increase revenue, I suspect that it was also done to try and lure travellers like me away from legacy carriers. But why would I switch loyalty for an airline which doesn't even make it clear that if I pay the fee I may still be person #63 to receive an early boarding pass? No thank you...
Saving the first 15 BP numbers for passengers who pay for "business select" was done to (try to) lure business travelers. Offering automatic BPs starting with A16 to frequent fliers (A listers) was designed to lure business fliers.
I think this was done for revenue. Posters on FT asked how to sync their computer clocks to WN's time. Southwest decided that since checking in at T-24 has such much value to some passengers offering to do that for passengers who're willing to pay $10 makes sense.
AFAIK SW isn't changing family mid-boarding. JMO but it makes no sense for posters like DisNae to pay $10. There isn't much of a difference between a high A BP and boarding between the A and B passengers.