My most frequent use of action buttons is with emails and YouTube. Both Gmail and Inbox use more than 1 action button (on Inbox those would be to mark Done and Reply). On YouTube it has Watch Later and Turn Off. It can get annoying quickly to always have to click on the button to show the popup with all buttons, when it could've been just there. And at least in these cases, I believe the first button would be the most used one.
This idea could also be expanded to: allow the first 2 buttons and removing the dismiss one (with X dismissing everywhere instead of locally); or even customizable action buttons (maybe per app?). These were my previous ideas, but I guessed it'd be better to keep it simple.