Apple explains why watchOS 27 drops support for Apple Watch series 6, 7, 8 and Ultra (opens original article in a new tab)

Apple is ending watchOS 27 support for older Apple Watch models to prioritize performance for new AI features and an enhanced Siri experience, with older devices receiving security updates but not new features.

• Apple ends watchOS 27 support for Series 6, 7, 8, and Ultra
• New AI features and Siri improvements require more powerful hardware
• Older devices will still get security updates but not new features