Settings > Accessibility > Motion > Reduce motion and Settings > Accessibility > Display and text size > Reduce transparency make it usable-ish. There is hundreds of ms lag at times inexplicably w/touch and upwards of a second plus when connected to CarPlay. But I can't blame iOS 26. I have to reboot this thing sometimes weekly, sometimes less frequent than that since iOS 18. I can no longer justify spending hundreds of dollars on things that don't meet my standard of "works" even if it's 2025.
Security updates are typically available for the most current 2 OS versions, and 18 is still officially supported, perhaps until 2026 or 2027. 18.7.3 exists with similar security updates as 26.2. It may not show up on iPhone as an update option without being on the beta 18 channel because they're trying to force people onto 26 using dark patterns, but it shows up on iPadOS without any additional magic.
>Liquid Glass is now mandatory if you care about security.
and
>It is not available. [...] the download is not showing up on the phone.