Pumps are not dangerous if they are used correctly. MDI is not dangerous if it is used correctly. If they are incorrectly used, refer to Darwin’s law.
A dental professor gave me sage advice when I was in dental school. A student was having problems with making a procedure come out correctly on the bench. He asked why. The professor responded that “if you do it correctly, there should be no problem”. The longer I live the better I understand the veracity of his statement.