I'm still on Sequoia on both my Macs. I updated my iPad Pro to iOS 26, decided it was meh, and am not updating my phone. My iPhone is over 4 years old and figure the new iOS will run like crap on it and then I'll be forced to get a new phone.
Indeed, it does run like crap on older phones. You made the right choice. I don't feel forced to upgrade my phone but the new OS definitely drains the battery faster and feels slightly sluggish, making me regret the "upgrade."
Agree that iOS 26 is trash and it empty my iPhone 13 mini battery in less time than I need to write it.