I find myself looking at some of the bikes and half-agreeing with he comments on the straight line between top tube and rear triangle; it’s a pleasing thing to my eye and so I find myself drawn to that. The Transitions above please in that respect.
One thing that does grate though is the lack of parallelism(?) between fork/headtube and seatpost tube. Too slack in the head tube and the bike (to me) looks like it is going to collapse, too upright and it just looks odd. That is, I think, the reason that the Smugglar is not an object of desire; my eyes think it is subtly “off”.
The same with weird angles, extra bits of material or shapes. I want a bike that looks smooth, clean, neat. Possibly with some subtle curves rather than brutal straight lines and sharp corners. As an example, I used to want a Bronson. It was more bke than I would ever need, but it ticked _that_ box. The latest model just looks a bit wrong though. It’s gone “sharp edges” and it has lost its shine.
Oddly, I look at motorbikes and all that goes out of the window. The Ducati 1098 ticks every single box on the list of things I like and is very much an object of desire.