Dojji, there is some merit in your point but you're oversimplifying.
Good teams now generally have at least 3 relievers that could be classified as good.
Let's look at the 2016 Guardians.
Their top 3 relievers, the guys that Francona used as much as possible in the postseason, were Miller, Allen and Shaw.
You could call Miller Mr. Excellent - 1.45 ERA for the season
Call Allen Mr. Very Good - 2.51 ERA
Call Shaw Mr. Good - 3.24 ERA
The traditional way to employ these 3 guys would be to use Mr. Good, then Mr. Very Good, then Mr. Excellent.
But what Tito generally did was use Mr. Excellent, Mr. Good, then Mr. Very Good.