Whilst these appear to meet the requirements of machinery safety regulations, imo they are a poor solution due to the design of the flap and the ease with which the flap can be dislodged from the base.
The event at the root of this discussion highlights the short comings of this design. I believe that the "close call" should be discussed with staff at the Electrical Safety Office within Worksafe with a view to having this style of switch discontinued on "hobby" machinery.