Google has replaced the Google Assistant app on Android with Gemini by default
(www.androidauthority.com)
It wasn't the app. It was the idea that rather than continue to default to a good app, they would default to their own poorer product, attempting to force it on consumers. I knew it would only get worse from there. No regrets. It's just unfortunate that android continues to be further locked down too. It used to be more open and customisable.