Using a custom card as a VIEW

Assume I need to have some card to occupy a whole view.
Then I would probably use a “panel: true” mode:

title: xxx
path: xxx
subview: true # just an example, could be not specified
cards:
  - type: custom:mini-graph-card
    entities:
      - sensor.xxx

But it is also possible to add this card as a VIEW:

title: xxx
path: xxx
subview: true
cards: []
type: custom:mini-graph-card
entities:
  - entity: sensor.xxx

Of course, there is a known “layout-card” example which is used for a whole view.
I wonder are there any benefits of using a card as a view (not in a “panel” mode).
The only difference is that in “panel” mode a card does not have border-radius, and in this “not traditional” way it does.

Perhaps this “way” may be used along with auto-entities to create sections…
Will test it.