I would like the dashboard card features to be able to be displayed side-by-side. It wastes a lot of space to have them only vertically stacked.
I really like how the thermostat card looks when you open up the climate entity in a sub window:
However, this arrangement is not possible on the dashboard, instead you have to stack the features and I think it is ugly besides wasting a lot of space:
Another thought for the features, since quite a few of them only allow 2 different states, an option to show a single toggle button would be nice in addition to the drop-down or multiple-icon views.