The ⎋esc button doesn't exactly same as that in the native Control Strip, it seems to that the buttons are 'locked' when pressing some keys:

• I cannot exit from Switch bars (⌘ ⇥tab) without triggering anything (when holding ⌘ ) by pressing esc.
• Force Quit... ( ⌘⌥ ⎋esc ) cannot be triggered.

Furthermore:

• (very low possibility and can be denied) Finder Browsers in some specific apps cannot be closed by pressing ⎋esc.