Why do states not allow you to aquire experience working while in school?

So to add some context ive been in school getting a bachelor's for surveying and working full time under a licensed surveyor for 3 years. I was looking into the state of alaska's requirements to get a professional surveying license and it states you can't count work experience concurrently with school. The requirements to be licensed is 4 years experience and a 4 year degree. Why does this rule exist?