Knowedge is it's own reward.
It is "important" IMO that we know exactly how stars function from a scientific perspective so we can take full advantage of what nature has to offer us. For instance, this information could eventually lead to new types electromagnetic propulsions systems, new energy spectrums to tap into using photocell technologies, etc. Accurate scientific knowledge is crucial for advancement in all areas of science. Why would anyone wish to believe a myth if they don't have to?