Not OP but I'm the same; I use Firefox to do stuff. All I need is a web browser and do it manually.

On my Android phone I've turned off assistant, and use Nova launcher's search bar to open Firefox and search on DuckDuckGo.

Assistants really aren't that great; you sacrifice privacy for a tool that can launch a search for you when you can just type it in yourself - whats the point? The only time I've ever found an assistant app vaguely useful was when I tried it while driving. But after a couple of days I decided to turn it off again because I didn't want the phone listening all the time just so I could occasionally say "Ok Google, play the news". I found it too poor to manage Google Maps. I might try it again for a longer trip, but day to day, don't get the point.

I'd also feel self concious using it out and about, and lose privacy not just to Google but to every rando I walk past. And then I don't get in the habit of using it in my own home. Add to that the general creepy feeling of devices always listening and it's a hard pass. I suspect I'm not alone in that.

I've seen reports suggesting Amazon is struggling to justify Alexa, because apart from a novelty and basic voice control for playing music it just doesn't make them money and people don't use it that much. They were hoping people would use it go shopping but who wants to shop without seeing something? I'm not going to say "Alexa buy me a TV" and I'm also not going to say "Alexa order me some washing powder". I've honestly never see anyone in real life saying "Ok Google" or "Siri"; the only times I've ever seen them used is chatting in a bar and someone is showing off something silly.

As far I can tell, Voice Assistants are just gimmicks on phones. Cortana was utterly useless on PCs and died a death. About the only useage I can see them being useful for is as fancy switches for smart homes. "Alexa, turn on the lights". That doesn't exactly require high end artificial intelligence. Maybe useful on PCs in the long term if they can actually do sophisticated tasks like analyse a spreadsheet or summarise a paper for you. But day to day now? Pretty pointless to me.