Strange no one had ever made the wankel engine work. Surely Mazda had their best intention with this design. Like the CVT transmission. I heard the latest ones are very good. Maybe someone should give it another go. Fed up with this EV-ism these days.
Emission problems are the main problem. This is why Mazda dropped it. They talked about it for a while and almost did re-introduce the motor. However economics got the best of the deal. Strong engine in a compact design.