But that's not really the simpler explanation.
Sure it is. We've been sitting on the answers for over a century, since Birkeland. (I'm talking about laboratory tests here, not mathematical models.) Assuming that our mass measurements are wrong doesn't fundamentally change anything; you'll end up inventing more "dark matter-like" theories to make everything work. The H-R diagram isn't what it seems, either.
The best primer on the subject is Donald Scott's THE ELECTRIC SKY
. There are many other fine books, but this one is the best intro for newcomers.