Why would we schedule P5 teams, the entirety of the SEC doesn't even do that.
That's not true.
LSU played Miami this year. Nobody anticipated Miami would be bad given they were ranked 8th at the time.
Auburn played Washington who was 6th at the time.
Tennessee played West Virginia.
Florida plays FSU every year, which is usually elite.
Alabama frequently plays a high level early season game. Nobody thought Louisville would be this bad when that game was scheduled. Last year FSU was ranked 3rd when they played them. In 2016 they played USC. 2015 Wisconsin. Etc.
South Carolina plays Clemson every year and last year they played NC State too.
Texas A&M played Clemson and I think they have them again next year.
Miss St. played Kansas St.
Ole Miss played Texas Tech
Georgia plays Georgia Tech every year and also played Notre Dame last year.
Good teams often play other good teams, including the SEC. We are not there yet, but, in a few years, if Dino gets his cake baked the way he wants, we should join them from time to time.