I’m sorry but I can’t agree with your comments. Look up what Erik cortina has to say on the subject.Yes! if you dont your going to do far more chamber cleaning ! brass expands to be a tight fit in the chamber on firing then relaxes , leaving crud behind .
Do i need to point out that chambers need cleaning on a rifle even when you dont introduce more crud ?
Only looking for MOA ? well MOA is 1/60th of a single degree , so yeah everything matters accuraccy wise . Thats before we think of the crud in your chamber holding moisture and rusting