Do opinions really matter in today's modern society? if not, how has our "dealings" changed how we interpret certain things?

Yes, opinions do matter in today's society. 

Hope this helps!

This is kind of up to your opinion.
 
But if I had a say in it, it'd be that opinions don't matter, but everyone takes them to heart. Good or bad. So if you're walking down the street and you have purple shoes and someone says "Ew. Purple." That obviously shouldn't matter, but it does to a lot of people. 

Hope this helps. 

Ifound this on google “separation of powers. a fundamental principle of the united states government, whereby powers and responsibilities are divided among the legislative branch, executive branch, and judicial branch.” i hope this you for what your looking for