Is the focus style like this on purpose?

I would expect something similar to other focus styles:

I also miss active styles atm

I think in some places the buttons could use more padding

or align better with the radius of the dialogs for example:

Now:

Proposed:

Same for in card footers, it feels a bit cramped?

Maybe we should use the small variant there even?

Disabled danger buttons, don't really look disabled?

Shouldn't this add button just be a normal button?

So remove the appearance="filled"

It is in draft, so you might know about it already:

Some buttons are using a class to make it red, and are not updated yet:

Colors of the done button in lovelace edit mode look a bit weird on that background:

I love the fact that the intent is to bring a more uniform UI to HA.

Some notes on my part:

• Make the description of the action that the button executes more clear;
• Primary action: align to the right, secondary action to the left of that. (Usability) Then always have a button on the left side to cancel the current action.
• Make all buttons look like buttons, and make sure that the styling reflects the action or it's state (disabled, primary action, secondary action, cancel, etc).

https://uxdesign.cc/button-design-user-interface-components-series-85243b6736c7