And also, how can you say Blender is not battle-proven? I mean, the big studios use Maya like fortune 500 companies use Microsoft Windows - doesn't mean Linux isn't battle proven.
I haven't used blender much. It's too focused on animation. I mainly make more engineering style things for 3D printing. Even though it can technically do that, the interface just rubs me the wrong way somehow. And i can use Fusion 360 for free.
I have used Blender for 3D printing, though. Architectural design, as well.
The interface is a rub at first, and then again after you get used to it and have to use something else. :-)
Those are different niches. Not even Apple has managed to budge Window out of corporate environments, though it is a lot more present than 20 years ago.
I imagine it's similar with Blender and Maya: do they fill the exact same space? Or is Blender adopted by different types of companies (probably smaller)?
You asked the right questions, IMO, and I think they are self evident.
> do they fill the exact same space?
No.
> is Blender adopted by different types of companies?
Yes.
A company or institution that has money to burn will opt for more "professional" suites (Maya, Microsoft, ...). Smaller entities will use the cheaper alternatives (Blender, Linux, ...).