It's not completely different but it's far from completely the same in my opinion.
If you choose to disable Google Assistant completely, follow these steps:
Open the Google app and select Menu (the three bars)
go to Settings
Google Assistant section click Settings > Phone and disable the Assistant option
I have a custom domain and disabled it for my family:Switch off Google Assistant (for entire custom domain) Click Search and Assistant. Tip: Scroll to see all services. ... Control who uses Search and Assistant in your organization
At the left, select the organizational unit.
Select On or Off.
To keep the service turned on or off even when the service is turned on or off for the parent organizational unit, click Override.No matter how many damn Google Assistant settings I disable in how many fractal menus, it STILL "helpfully" pops up if I say out loud "ok google"!
Like, "heyy I noticed you're trying to talk to me though I'm disabled, would you like to enable me?"
Stop spying on me you piece of malware.
And, still, I can install LineageOS or other privacy-respecting systems on my phone. We don't have any custom firmware for an Echo or Alexa yet (to the best of my knowledge.)
In my experience a lot of people have privacy concerns over the speakers, and underestimate the smartphone.
People do underestimate the smartphone, but I feel the problem with smart speakers is even more pronounced. I mean, voice is the primary interface for a smart speaker.
But a smart speaker just plays some music and tells you the weather. It's not nearly enough utility to be worth the privacy risks.
And if you are worried about the companies lying about not recording 24/7 why do you trust them to disable the recording done by assistants on your phone?