Well it seems to be the trend nowadays and Frontier seemed originally slated to be Macross/Kawamori's take on this sub-genre.
Blasphemy, without the love triangle, all we'd get would be Gundam with variable fighters.
As convoluted as the triangle in Plus was, at least there were hints of a previous relationship as well as continued attraction between Isamu and Myung. The iffiest ones IMO are in II, where it Sylvie and Hibiki should have been given more time to develop as a couple and in Macross 7 where Basara should have been less... asexual.