I think it's to avoid having two sets of data points. I think the "view angle" affects the "convex amount" so that edge-view = flat and all other viewing angles "bump" the data points a little bit to give the "convex" look.
I would question whether a PWM "technically" counts as digital... It is on and off, sure, but so is a mechanical power switch, which few would describe as digital. "Digital" is more when we get higher level values represented by multiple signals that are on or off (aka bits).
A mechanical power switch can certainly be digital; the Harvard Mark I digital computer was made entirely out of mechanical power switches, actuated by solenoids (so-called "relays"). It depends on how you use it—as you say, by combining multiple different bits, either simultaneously or serially.
I agree that a PWM signal is not really a digital signal, but it's kind of on the edge—for example, https://tinyurl.com/25y54mph is a simulation I designed of a completely analog PWM generator (a simulated LM324 op-amp, five transistors, 13 resistors, and a couple of caps), and several vendors offer better-designed versions of the same thing on an IC, but you can also get a perfectly adequate PWM signal out of a digital GPIO pin, and the PWM peripherals commonly included in microcontrollers are entirely digital.
Same for me. The car looks beautiful and then you see the dashboard and it's just plain ugly. Doesn't match the rest of the car at all. It's easy enough to simply offer another trim option for the dash though.
Doesn't seem to work on mobile at all. Tables that I add are not shown in the diagram. The diagram area is not visible unless I scroll sideways.I cannot scroll sideways, unless I request desktop site and scroll there. But I still don't see any entities in the diagram. When I use the buttons to add tables in the diagram, they also do not show up in the grid, but only on the left in the textual list of tables. Seems like a complete non-functional tool on mobile.
Usually I wouldn't care too much about a tool like this running on mobile, but not at a PC right now, so that's all I can give feedback about.