Lets Go!!!
This is a great step in the right direction. This will definitely make the animation editor a lot more useful. However, I don’t think I’ll be using it on blender (Blender is a lot more powerful and has some more tools that I think you need to implement). Still a great update!
I would like to suggest A few things:

You need to make it easier to tell what axis each curve is controlling. Because I find this very hard to tell which is which
In Blender these curves are color coded. (The ones in studio might be color coded? The color seems kind of off, blue, orange, green??? Seems kinda weird. I would recommend change those colors).
And when you click a curve to work with in Blender you’ll see a box light up for what’s being edited.
And in studio… uhh. Where are they??? Really hard to tell what I’m actually editing.
This next one is mostly just personal preference, but I find it annoying when it Scrolls down automatically when I start to make a curve go down to far. (Blender does not do this and simply makes it go off-screen. I might just be used to this. I would like an option for this however).
You’re getting there! This update is a very good step in the right direction. I just think that this graph editor is a bit lack luster (At least compared to Blender).
Also, out of curiosity. Why weren’t you able to add Bezier curves a long with this? Are there some technical things with ROBLOX preventing it from happening right now? Or is it just tricky to implement?
Edit:
Ok, I messed with a bit more uhh. That is a lot of colors… Stick to red, green and blue. And maybe make position changes a lighter or darker shade of the colors? Or maybe outline them?

I also found that clicking the down arrow on the part you’re trying to animate will show what’s editing what. I do think it might be a bit tricky for a newer animator to find this. Though maybe I’m wrong. I think this should be visible by default.