...You can't have real traction control unless you're actually monitoring traction, which by definition requires front and rear wheel sensors...
TC on motorcycles is an interesting question, to be sure. And how one defines "monitoring traction" is vital. By definition, to measure rear wheel traction, you'd have to know how fast the wheel was moving
and how fast the bike is moving (relative to the ground). A front wheel sensor makes sense in a car, because it rarely leaves the ground, and is therefore a good measure of how fast the ground is moving. Does it make sense on a bike, where the front wheel will leave the ground and slow down? And what of bikes that have a front wheel speed sensor for the speedometer? Do we have to prove the speedo (regardless of whether the speedo display is still present) doesn't talk to the ECU?
And as for the rear wheel speed sensor, because there is no differential (and no opportunity for the drive tire to be moving at a variable rate from the drive mechanism), a speed sensor on the chain, or on the front sprocket would give you the same info. Would those kind of sensors also be outlawed? Again, on many bikes, the stock speedometer is driven by such sensors (even if it's just dividing the tach by what gear you're in). Do we have to prove the speedo doesn't talk to the ECU?
Which is where mfrs have gone, with their ECUs looking for spikes in engine speed that betray a loss of traction. And if I've read your ECU rule correctly, one can install an aftermarket ECU, as long as it connects to the OEM harness, and hasn't been advertised as TC. So an ECU advertised as containing "anti-exploding engine" features that looks for spikes in engine speed (betraying a loss of traction, or possibly an exploding engine) would be legal?
So outlawing wheel sensors woudn't be worth the trouble, and outlawing ECUs because of the way they are advertised doesn't seem prudent.
Correct me if I'm wrong, but I think the FIA solved this (in F1) by going to a spec ECU (which does not look for nor react to spikes in engine speed). Can there be a spec (un-flashable) ECU for each make in AFM? If so, would that level the playing field too much?
No easy answer. I do not envy the board their process.