Are there any like that anywhere? I would think part of the problem is that induction settings are usually in discrete steps so a knob, which is what I assume you mean by physical control, may not be any better than a simple +\- control and would stick up from a seamless cooktop. Also, the highest end ones like Thermadors seem to focus on making the entire cooktop usable which kind of breaks the discrete burner area paradigm that knobs would suggest. Closest I’ve seems is a little puck on Samsung cooktops that you can use to adjust the controls but I would hate worrying about losing it.
I want 200 discrete settings then, so a knob is better. Or at least I think I want that considering how many micro adjustments I make on all stoves I've used before
I don't know what it is about induction that makes a rheostatic-like control unfeasible but the most I've seen is about 20 levels so you might be waiting a while.
Many more are a problem without a knob to speed through the steps.
There's no reason an induction hob can't be run with delta-sigma over it's normal low-resolution PWM to get accurate, high-resolution average power control.
1% power accuracy is easy, 0.1% is a few bucks more per "burner".
The problem I've seen with some induction hobs is that the low power settings are basically 1 second on / 5 seconds off, which is kinda annoying when the liquid goes between boiling violently / not boiling at all. Maybe thicker pots would help smoothing that out, though.
