The Mathews Switchback is arguably one of the best hunting compound bows of all time... Certainly in the top 3 of all time... It's velvet smooth draw cycle, silence, and forgiveness are the Switchback's best attributes.
I absolutely agree that your particular set-up (assuming it's well-tuned) with more or less 600 grains of total arrow weight, 70lbs of draw @ 29" and a compact fixed blade broadhead is a deadly effective combination for nearly any small to medium-large game animal on the planet.
I've had a bow shop for over 20 years, and if every customer had your perspective, I would be out of business...LOL.. Quite honestly, the technology advancements from the first Solocam design to today's aggressive dual-cam designs are mainly in the form of speed that is paid for by the hunter at the price of a nasty draw cycle and potentially more vibration... In fairness, there have also been some very beneficial tech advancements with the latest bows which have come in the forms of tunability, and much more effective vibration dampening systems than in years past. Interestingly, Mathews was ahead of the curve on that vibration dampening technology as well very early on...
Much of what is on offer with new compound bows is a result of very effective marketing by the manufacturers. Specifically in regard to speed which certainly has a place in the equation, but in my opinion, far too much emphasis is placed on speed which has caused many bow hunters to sacrifice forgiveness, accuracy, comfort, and consistency in the name of shooting one pin out to 40 yards which in my opinion is an over-rated benchmark.
I have many customers who get a new bow every year or two for no other reason than to have the ability to say they have the latest technology and there is nothing wrong with that... However, when it comes down to the basic necessities for an effective hunting set-up, if it ain't broke, don't fix it..!