Macross Plus....sounds familiar, but I'm not sure what you're talking about....
Seriously, I first saw Macross Plus, in its movie edition form, back in 1997. I've raved about it for years since then, and when I discovered this great 'Forum in 20?? we here spoke of, argued over, theorized, anthropomorphized, and even fantasized about Macross Plus forwards and backwards. Don't think that we fail to appreciate the masterpiece of work that Macross Plus is. It's just that after all of these years, it's all been said and done a thousand times over.
You do bring up a good point though, in that discussions here tend to focus more on "old school" Macross than its successors. I believe that has something to do with the fact that Macross Plus is but a side story in the Macross timeline, and doesn't leave much room for hypothesis or speculation. And, the majority of toys for Macross obviously favor the original Macross.
In summary, we all know and love Macross Plus. It's just that, well, Isamu, Guld and Myung have all grown up and moved on, and so have we.....