Google Assistant will disappear from your phone next month
TL;DR
Google will remove access to Google Assistant on Android phones and tablets starting 4 September. Paired devices such as smartwatches and headphones are affected too, according to an email apparently sent to some users and reported by 9to5Google. Gemini takes over as the default assistant. The Verge has asked Google to confirm the email is accurate.
Nauti's Take
The replacement brings a real gain: Gemini handles multi-step requests and context far better than the old Assistant, which makes routines more capable. The catch is the deadline, because Assistant access disappears from Android devices, smartwatches and headphones on September 4, and not every existing automation survives the migration.
Anyone relying on voice commands should test the important flows with Gemini beforehand and check device compatibility and the new privacy permissions.
Sources