IMO voice recognition will never be as good as the keyboard I'm typing this post with. Many have posted that bixby does things or response when not commanded, what many of you are missing is that bixby does things when it thinks it hears a command, background noise is a killer for voice recognition example.
Google just got their assist to cast, they can open youtube and play a playlist (I don't know who's list it is yet), when my brother was trying to get his tablet to get Gassist to cast, my S8+ responed to his command and casted when his didn't, I was over a meter or so away. I've had bixby start typing shit while giving a command once, I stop talking and bixby is still typing responing to a child crying 30 meters away, I think it's got to do with the pitch of the noise.
How you sit effects it, dry mouth effect it or slightest amount of food will effect it, yeah both work well some times, but shit man some times both suck. If I started typing shit with this keyboard every now and again, I'd arsehole it and buy a new one.
For me for VR to be a good tool it has to be from a Qcom or Scut and only from the bixby button or tapping the mic icon for Gassist.
The same task more or less in words and in Qcoms or Scuts
Bixby-- Connect to the chromecast tv - attached to - open youtube play (artist with song) or Qcom-- Alpha
Gassist-- Play (artist with song) on youtube on TV or Scut-- Playlist
Both VR's can get the long command right first time, but both can get it wrong more than once, even the Qcoms or Scuts can get it wrong more than once.
Google has better VR, some times it's so good and some times it's a shocker and when it comes after it been really good, it kinda hurts and leaves you thinking why.
Thinking, it can't be too many things causing so good to shocker in so little time period, thinking again, I might keep what I think is the cause to myself, no use helping those who are uncharitable.
Thinking again, I do that some times, even Bixby goes from hero to zero in so little time period, big chance it's the same reason, must suck standing there.
Thinking again it does become annoying some times, it must be the reason.
I'm sure the intelligence team will sort this out sooner or later.