I recently went through the same argument and I was really struggling to justify upgrading, not because the new models didn't feel better or I didn't enjoy shooting them but because I kept asking myself the question "Will a new bow help me kill more deer, elk, etc.?" and I couldn't say yes - If i do my job ,the current rig pounds.
I still ended up placing an order for a new Mach 35 (after shooting Hoyt literally my whole life). At the end of the day, the money isn't a big factor for me and I knew it might gnaw on me if I didn't try something new. I would wonder "what if?" so I said screw it, I can try something new and if I don't like it, I'll sell it, only be out a few hundred bucks and ride the Hoyt for another 3-5 years.
I increasingly fall into the if it isn't broke don't fix it mentality but sometimes you just have to mix it up. (I also pretty much have to shoot long ATA due to my draw length, so happy to provide thoughts / answer any questions on the new longer bows if you want.)