One must be very careful making statements like this. The only reason you're not seeing CPU-constrained webapps is because they aren't being created, because they would be constrained by the CPU. For example, I'm writing an app that would be significantly better if I could do fast client-side processing of data. Eventually I plan to use WebGL shaders, but I don't know if GLSL shaders can actually do what I need to do.
One must be very careful making statements like this. The only reason you're not seeing CPU-constrained webapps is because they aren't being created, because they would be constrained by the CPU. For example, I'm writing an app that would be significantly better if I could do fast client-side processing of data. Eventually I plan to use WebGL shaders, but I don't know if GLSL shaders can actually do what I need to do.
Your second sentence, however, is reasonable.