I agree. It has only been a few months since the split. I have noticed more and more uptake of OpenTofu amongst colleagues, and I've personally switched. The thing that makes the difference is what is running on people's laptops, because that's what people will eventually put into prod.
The point is that once they are no longer compatible, people would standardize on the one that they're familiar with which is most likely the one that's running on their machine.
But currently, people are equally comfortable with both; the CLI commands are exactly identical between the two, save for the name of the binary itself. In any org where both are in use, if people are forced to choose at some point, they will have to balance many other factors besides familiarity, such as features and confidence in the platform.
> The thing that makes the difference is what is running on people's laptops, because that's what people will eventually put into prod.
I disagree—I think support of deployment tooling (like Atlantis) is the bigger proof. If you are running terraform on your local machine it is likely a very small company.