Exported OBJs with N-gons output from MoI do look attractive and organized, but some programs (like renderers) hate n-gons. Maybe they cannot deal with t-splines.
Btw I've always wondering if MoI would support exporting OBJs with "Quads only" output in the future? Or maybe quad-remeshing with third-party softwares/plugins is the only way, rather than manual retopology?