Outside of Gemini, Google has done a decent job at packaging AI features that have a tangible benefit to users. However, they seem to be more purpose built instead of LLM's.
I find Gemini "somewhat useful", on a smartphone. It's not a game changer, but it can often answer the thing I want even when it misheard it, much better than Google Assistant.
A single command made me switch back to Google Assistant.
Every now and then, I'll leave the TV on while I fall asleep and for a few years now, I've just asked GA to turn off the specific tv in 2 hours. Whenever I tried to get Gemini to do the same, it would just turn off my tv immediately, no matter how I phrased the prompt.
Depending on when you tried that, it might've been fixed already.
I'm using GA on a Nest Mini, and Gemini on a smartphone. It started being unable to do pretty much anything; right now (Dec 2024) it can do all I ask it for, but still claims to be unable to fully replace GA.
Also have Samsung's Bixby, which has better integration with phone apps, and returning search results, but fails more than Gemini at summarizing them, or answering general questions... so yeah, YMMV.