Yes and no. If you were playing the kind of games we used to have in the Core 2 Duo days, then, yes, this kind of game would be GPU-limited. (Note, I don't mean get a 10 year old game and try playing it, I mean those games updated to run on today's graphics engines).
But today's games involve a completely different paradigm. Almost all the games today have such a huge focus on open worlds and modeling the interaction between hundreds of thousands of objects in real time. Even the most GPU-intensive such games can still realize bigger FPS gains with a CPU upgrade than a GPU upgrade.
But today's games involve a completely different paradigm. Almost all the games today have such a huge focus on open worlds and modeling the interaction between hundreds of thousands of objects in real time. Even the most GPU-intensive such games can still realize bigger FPS gains with a CPU upgrade than a GPU upgrade.