Why is Sample Rate an option. What is to be gained by slowing it down?

The RF output appears to be 40 pulses per second. Yet the data sampling rate is as fast as 1000 times per second. Is there an interesting explanation for why the sample rate can be faster than the data sending rate? And is there also a trade off for changing the “Samples before Tx”?

What product are you looking at? There may be valid reasons for what you see.