I had an RX2 also!It was great - small, manueverable, great handling and plenty of power! It did need to be tuned often, and we learned to do it ourselves as the local dealership didn’t seem to be able to do it right. We did replace the engine once, but the rebuild wasn’t done well and we only got about 25k miles out of it.
I would think the main problem with a ceramic Wankel would be the same as with every other ceramic engine prototype - as long as they work they’re great, but a small accident can crack the engine and it becomes worthless.
The ‘73 sported an enormous 4 barrel carburettor and a stomp on the foot feed would consume mass quantities...
I have 2 RX7s with over 175,000 miles on each. Best car I ever had and I have had over 20.. Bought my first RX7 because a friend of mine had one which he abused but it held up unbelievably.
They do not do well if one lets them sit idle over 3 weeks, especially if they have many miles on them.