What's not to like? Classic 321 look with 861 maintenance/upkeep.. great combo, especially with The Parts Situation. This very point is drawn out in most speedy authoritative sources; the transitional is special - and until recently, very attractively priced.
Oh, and if you're going to post interesting topics, please do get an avatar. Welcome.
Edit: I'll add a little more personal context. I really only got into speedies about a year and a bit ago, but I wanted a transitional right from the start. Late 2014, there were very few around, even into early/mid 2015.. but I agree with your observation, of late, they're everywhere. Quite a few 145.012's too. I guess it's the last hurrah. Once you're past -78, then it's more about the LE's.
Edit2: oh, and..
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