Yeh, you correctly guessed where I was going with that. Having spent time with the x56 (which also has no thumb button for secondary fire), it was an absolute requirement for my next stick. My pinky is just not as strong or responsive as my thumb, and on my throttle, I need to have a grip on the thrusters, the boost button, the FA off paddle, the pip macros hat and the countermeasures hat, plus switching the muscle memory for secondary fire to a totally different hand would SIGNIFICANTLY impact my ability for some time. Your mileage on that may vary of course, depending how much performance you demand from yourself on a day to day basis (if I'm not tip top, every day, I'll be killed, and I appreciate the game is not like that for everyone).
P.S. I tried using the 'press' on hats, it was a disaster, the hats couldn't be used for anything else due to stiffness to 'click' often requiring enough force to accidentally hit a directoin in the heat of the moment.