What about iOS 26 kept you away? I was hesitant when I got APP3, but was pleasantly surprised by how many longstanding issues with responsiveness and functionality it fixed for me (iPhone 15 Pro Max user).

I assume it's because of Liquid Glass. It's absolutely undercooked as a design system, but Apple knows which way its bread is buttered. So Liquid Glass on iOS is where it's the least bad, and I switched there knowing that. It was exactly as I thought: a regression in most places, but still manageable because Apple is laser-focused on the iPhone.

I didn't upgrade my Mac and at this point I'm wondering if I'll ever be tempted to update until I see what they do with macOS 27.

I guess you could ask "what about iOS 26 would make me want to upgrade?" My answer: nothing. Definitely not to get a slower and bugger UI, nor to get full support for headphones I could simply return for a full refund. I'm using iPhone 16 Pro.