We now have it on the sayso of the Pope that 'evolution is more than a theory'. His Holiness has come publicly to this conclusion long after most competent observers and many Christian thinkers had, effectively, accepted evolution as fact. So the Papal announcement, welcome as it is, cannot be said to have added much to our knowledge of the subject. Enlarging upon that thought It is easier to make factual statements than it is to decide dependably whether they are true or not.
Some factual statements are demonstrably true.
Most factual statements have a probability tag attached to them ranging from 'scarcely credible' to 'hardly deniable'. How can we attach, dependably, a probability rating to a given factual statement. We need something better than such, essentially lazy, approaches as those. Increasingly, people are coming to see the usefulness of 'conceptual models' as means of attaching probability ratings to factual statements. Most people are unaware of the phrase, conceptual model, but most thinking people tend to think that way without being conscious of the underlying procedures.