I'm probably not being terribly clear: I can merge polys just fine. Pick poly A, pick poly B, hit SHIFT+Z. two triangls become1 quad.
that's not the problem.
Meshes like Ryx's Orion, have about 100000 triangles. And there's no handy tool in lightwave to SAFELY remove edges like that.
Reduce-Polys will merge polys and drop edges--but it very often makes polys disappear for no discernible reason. Even on its most conservative and "safe" settings, it will make some 3 pt polys just vanish. Just to make sure, I tested it again on my HercMk1 model and watched it kill have the tail end of the main body. Very simple geometry back there, no degenerate polys or anything.