By the time you get around to actually buying a CPU the 7800X3D will probably have been usurped. Techspot recently ran this feature:
While I like the principle of minding a "bottleneck", that's the whole point of this feature, after all, and its conclusion that one shouldn't really upgrade beyond an RTX 4070 or RX 7800 XT if he is still running a R5-5600 or lesser CPU, it really conveys why that has become such a problematic term in modern gaming, and that's without them stepping too deeply into older or specific titles that lean almost entirely on the first few threads, but are still incredibly demanding by modern standards on those threads.
Because, depending on the game, resolution, and settings, even the 7800X3D can become the limiting component for fps output when paired with the RTX 4070. This would be true for an even lesser GPU under certain conditions, I'm sure.
The bottom line is that CPUs never really become irrelevant because they're
always potentially a bottleneck. You get what you get. So you don't have to worry about that stuff too much.