It's completely superfluous next to Google Assistant and should have never been released in the first place. Samsung had better use their resources to push out timely updates rather than coming up with inferior clones of software that's already there.
You obviously have no clue what Bixby is. You're only hypothesizing what it is.
Bixby and Google's Assistant is philosphically and technically different.
Bixby is a voice enabled user interface that attempts to replace touch interface.
It will do things locally on your phone that no other voice enabled agents can. For example, simply saying the word "Change my language setting to French" will do just that. In contract, using touch, it requires a tour of the setting menu, digging deeply through the language menu tree to find the French language item and enable it. That requires multiple steps. This is especially helpful for those who dont know the menu tree system of Android. Using a voice interface will save time and hassle to enable such features.
Over time, the capabilities of Bixby will grow as it will integrate with thirdparty apps. When that happens, you can say things like, "Open Facebook and like the first post made by my best friend (Tom) and send him the picture that I took last Wednesday with him. Also, set up a reminder to give him a call when I get home". All of that in one sentence. Seriously. Google's Assitant cant do that nor any other voice agent cant do that.
To give you some ideas, here are some videos showing its capabilities: