One guess I had about wingless design (which never got infirmed nor confirmed in their case) was that they were aiming at better capability of navigating through trafic and chasing another Hypercar.
Downforce from ground effects is supposedly far less perturbated by dirty air than wing produced downforce.
But it seems they misjuged the difficulties to seal air under the car without skirts or active suspentions, especially on rough and bumpy tarmac.
That being said, from what Jansonnie communicated about, it looks like the wingless approach wasn't the problem, squared tire size always was the issue. Bolting a wing on is more of a side effect since switching to 29/36 meant mandatory rearward biased center of pressure.
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