Yes but the wheels should be round rather than oval or square. The engine should be capable of reaching certain metrics like reasonably smooth acceleration or the ability to reach expected speeds in a certain period of time without spraying fuel about on the street. Not exploding when hit by another cat while the blinker on active for a particular turning direction would be another.Asking whether fiction or mechanics is more important is like asking which is more important to a car, the wheels or the engine. You need both or you're going nowhere. And if they aren't connected solidly, you're going to break down in short order.
5e has areas that fail to meet those types standards and we have a playtest giving every indication that the last decade of"fix it yourself, your the gm" is going to continue.
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