The last indicator that I use to fine-tune my saddle height is whether or not I find myself sliding off the back edge of the saddle when climbing moderate hills while seated, as I extend my leg comfortably for easiest pedaling.

The act of near-full leg extension is pretty intuitive, so from there I just raise the saddle if I feel the back edge of the saddle causing a pressure point.

A too-high saddle, otoh, seems more obvious, but can be a false alarm if the saddle happens to be too far from the bars, since an overly bent-over position will then make the saddle nose seem too high. Sometimes sliding the saddle foreward is the final tweak that gives a best-overall fit in lieu of lowering the saddle further.

As for the Townie bike, I think it's fine for very low-effort cycling on level ground.
It would be interesting to see how many easy miles that one could ride one for, perhaps five?
Seems like the reclined seat tube allows more leg extension for a given saddle height from the ground, without resorting to a lower bottom bracket and shorter cranks.