We use evolution every day in pharmaceuticals. We use it in our crops and in domesticated animals. If it was under question we wouldn’t call it a theory. Evolution is as real as gravity except it has even more evidence and scientific understanding, while gravity still doesn’t play nice with quantum mechanics and of course general relativity defines it as something most people cannot intuit. Evolution is a fact. I don’t see two related concepts here. Besides, consider that the second closest hypothesis that explains life on earth is that a bearded man in the sky got bored one day and created the universe, then made a man and a woman and gave them a bunch of dinosaurs to play with but instead they played with a snake, an apple, and each other’s bodies until he kicked them out of his play garden because they didn’t play by his rules, so the two of them through tremendous amounts of incest populated the earth (a fact easily disproven by a number of methods including simple genetic testing). No I don’t think it would be better to call the theory of evolution anything but a proven fact. If people want to believe in fairy tales that’s fine. But that’s not a reason to cloud scientific discovery.
I don’t know about other people, but your definition of “theory” doesn’t match mine. To me the word “theory” is almost identical to “hypothesis”, but generally a bit more comprehensive (eg consists of multiple hypothesis). Calling something a theory doesn’t require any proof nor that it be true.
There are a number of theories related to gravity. That doesn’t mean gravity isn’t a fact, it just means we don’t 100% understand how it works in all situations (eg quantum).
Similar for evolution - there are various scientific theories about the origins of species. And it is absolutely the case that we don’t know 100% how we got from Big Bang to here, thus the theories are still theories. If you just want to point to Darwinism and say fact, you’d be doing a large disservice to us all.
Gravity continued being the same thing before Newton, after Newton, and after Einstein. If we come up with a new theory of gravity, it's distinct from the phenomenon we observe. The planets are still going to go around and around, etc.
