Right now, if you want to make something a checkbox you have to create a #newtag, a property, and then assign a checkbox to that property.
Instead, a checkbox should be a built-in feature, accessible from the slash command.
There are many reasons why people might wish to use checkboxes rather than a status. It is good for shopping or packing lists, or for sub-tasks, etc.
It would also look cleaner since there would be no need to display a tag next to each item.