Yeah, I'm Norwegian, and maybe the Scandinavian languages makes us extra likely to make those mistakes, but overall English hyphen rules to a large extent boils down to feels. Words "graduate" to hyphens over time as and when they start to become seen as a unit, and then sometimes eventually fuse into words. E-mail to email is one of those. And that pipeline is also not uniform geographically so different English speakers will disagree about what should have hyphens where and when...
Yeah, I'm Norwegian, and maybe the Scandinavian languages makes us extra likely to make those mistakes, but overall English hyphen rules to a large extent boils down to feels. Words "graduate" to hyphens over time as and when they start to become seen as a unit, and then sometimes eventually fuse into words. E-mail to email is one of those. And that pipeline is also not uniform geographically so different English speakers will disagree about what should have hyphens where and when...