C. S. Lewis quotes Thomas Aquinas in The Discarded Image:
In astronomy an account is given of eccentricities and epicycles on the ground that if their assumption is made the sensible appearances as regards celestial motion can be saved. But this is not a strict proof since for all we know they could also be saved by some different assumption.
In other words, explanatoriness is necessary but not sufficient. It is uncomfortable to think of the number of people who do not know this.