I'm going to assume "stumble" means stuttering or whatnot. In which case, that depends on the CPU moreso than the GPU. It's in the best interest of a GPU company to showcase their product in GPU dependent scenarios.
If you're stuttering in GPU dependent scenarios though, well, you likely realize you're due for a GPU upgrade anyway.
Not really, not on the CPU side. Games where the CPU is the bottleneck and not the GPU, are by far in the minority by a good margin. When you say things like stuttering in the first sentence (i see you added a more accurate qualifier later), which implies a sub 60fps frame rate, whether it's average's or 1% lows, unless your CPU is either truly ancient, seriously thread starved or worse you playing poorly optimized game that also happens to be a thread hog like COD Warzone on a very old CPU, what your saying generally just isn't the case. As stated there are some fringe situations but that always applies in gaming IME. Even my old Ivy bridge Xeon can drive a RTX 2080 Ti at 4K60hz and keep up with even then newest CPUs. And should I choose to render at 1440/1080P it is still competitve with 1st/2nd gen ryzen. My IVB Xeon is only a bottleneck at high refresh rates but then your also not talking about sub 60fps stuttering trash at that point either. If you are stuttering at 100+ FPS something else is more likely the root of the issue like bad drivers/needing to run something like DDU, turning on vsync/gsync, its time for a fresh win 10 install or updating your bios. So I'll have to strongly disagree with you on the CPU more likely being the root cause of such behavior. Unless you see 85% + CPU utlization (either per core or as a CPU as a whole) at which point it actually does show a bottleneck on the CPU. Otherwise it's just not how rendering typically works.
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