I'm not talking about lever type.

I'm talking about how the brake shoe post mounts to the arm. The ones on this bike hold the posts inboard of the arm (between the frame or fork and the arm). This does not seem to be the predominant design for smooth post cantilevers -- most seem to hold the posts outboard of the arm.

For example, see these brakes:

Set Up A Cantilever Rim Brake - MadeGood | Free bike repair resource

Or the "Basic cantilevers" here:

https://sheldonbrown.com/harris/cantilevers/

The brake shoe posts are mounted to the outboard side of the arm. Shimano's BR-MC16s seem to be a little unique for smooth post cantilevers in that they hold the shoes inboard of the arm. That's all I'm saying -- I'm just commenting that this particular design of cantilever worked very well for me, and was wondering if others have found the same.