I read on https://flybytheseatofourpants.com/flying-on-a-buddy-pass/:
Travel Light. Traveling on standby means you might not get on a flight. Checking bags to your final destination can be complicated when you don’t make the flight. We always travel with only carry-on luggage. You will get a seat last minute which means you need to board quickly. Have your stuff together! Make sure you don’t look like a lot of work, or they may not hold the door for you.
It seems to implies that traveling without checked-in luggage increase the likelihood that a standby passenger gets into their flight. Is that true?