UPDATE: See end for some things I figured out.

I'm giving Drupal Canvas a look through and I'm trying to figure out where it works into the kind of sites I work on. It looks to me that Drupal Canvas is (currently) only a solution for building stand alone pages.

Is this accurate or am I missing something?

The sites I work on are highly structured and template driven. I'm just looking for something that will allow me and my users some flexibility within that structure, but not something that would require every publishing action to be a design decision. My current favored approach is to break the pages down into component blocks that can be manipulated with Layout Builder.

For the forseeable future, it looks like that might still be the most sensible approach?

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UPDATE: I'm wrong that Drupal Canvas is only for building stand alone pages. It can also be used to manage a Display Mode layout or your site wrapper. The latter is evident since Canvas will actually disable your ability to use the Blocks Layout admin console for any theme that's added to Canvas.

However, speaking from the viewpoint of someone who builds sites with highly structured content, Canvas still appears to be most appealing to someone who would *want* to build stand alone pages with it.

Also, the best demo of Canvas I've found is the one in Drupal CMS 2.0 Beta. All the other ones I've tried are worthless.
https://www.drupal.org/project/cms/releases/2.0.0-beta2