I can use different materials (with different smoothing angles) and the cut and paste technique. So I can create smooth and hard edges perfectly in LW.

But if I import an obj model then it needs some re-work. And that can be annoying indeed. Maybe Maya can do it better, but I cannot afford 7,000.- Euro plus paid upgrades and support for that.

I hope Newtek realizes this little issue. It is really a minor problem since I never stumbled over it up to now. I started using LW with version 7.5 and we have 9.5 now.
I just heard of it from you and this imported high poly mesh.

It will not happen if you model in LW directly.