To make iOS 26 icons less blurry, you can try adjusting the Accessibility settings by going to Settings > Accessibility > Display & Text Size and enabling "Reduce Transparency" and "Increase Contrast." Additionally, you can customize your app icons by long-pressing on the Home Screen, tapping "Edit," and selecting different icon styles like "Dark" or "Tinted" for better clarity.
personally, it’s really that YouTube icon that looks really weird to me kind of blurry at the bottom.
there’s more details on Macobserver on fixes I think.