I think marriage preparation classes should check which love languages you speak and if you don't speak the same ones then you should nix the M.
Definitely I think the classes should focus WAY more on communication and compatibility than I remember they did 30-odd years ago. Not sure what they're like now, but W and I attended two different ones, and here we are with lifelong difficulties. Perhaps if we'd had a *completely* honest and frank discussion about the relative importance of sex to each of us, we might not have been married in the first place, and perhaps that would have been the best thing. Moot now, of course.