True, but the naming does matter. Calling Thing::default() clearly communicates that your just getting baseline values and not a lot of magical other initialization stuff going on— with a Thing::Thing() in C++, you're really at the mercy of whatever the project conventions are for how "fat" the constructor is going to be.

I think the naming is also important for cases where there are potentially multiple reasonable defaults, even something as basic as the difference between Vector3::Vector3() and Vector3::zero().