Running this as PB1 on my 13 mini and, compared to iOS 26, feels like taking off a supremely tight shoe. It's genuinely impressive that, up to iOS 26.5.2, I was still having that bug where, on occasion, my homescreen icons wouldn't even load after unlocking, and the homescreen wallpaper would show. That, and Photos was constantly regenerating its menus under "Collections" and fading in slowly. Changing and modifying wallpapers no longer does a self-DDoS on my phone, too, and RAM management is back to actually working properly.
Considering that Apple ran with increasing QoL and UX as their main headline during WWDC, I felt confident that even dev beta 1 of iOS 27 would be leagues ahead of whatever was happening on iOS 26. I wouldn't be surprised if the majority of effort went towards the foundation of iOS 27 during the point releases of iOS 26.