Wikipedia has the surface temperature of Venus at 464C, would SiC be able to handle that?
I'm sure it's possible to build something that could operate at these kinds of temperatures permanently, but it would probably need an RTG (nuclear battery) and may be hard to test it on earth and also allow for thermal expansion and shrinkage (hard to keep the probe at this temperature for the entirety of travel to Venus). We'd also need to design lubricants for gears, cameras and sensors that can tolerate a wide range of temperatures, etc.
The upside of all this is that there are probably legit industrial use cases here on earth for electronics that are resilient in extreme temperature ranges, and in satellites as well.
But you're right - just because the silicon can go to 500C doesn't mean there aren't a gazillion other problems. You can't even use normal solder at that temperature.
The issue with Venus is really cost vs benefit any probe would have a very short life span as in hours to maybe maybe days.
At the same cost you can send probably multiple missions to Mars that would last months if not years.
We had probes on Venus using 1960’s technology we can do that again. Selling the political oversight and even the public on this however is far harder than designing and building them.