Yes. And there are two types of increases - a generalized speed increase and a specialized increase. Sometimes u can be lost when u are learning a completely new style even if u are good at something else until u figure out the syntax or pattern of that new style.
I think first 5 years is like a stem cell education and generalized. We all get the same fundamentals. Then it differentiates into a specialized area. We build on skills that stack and then learn quickly on similar arrangements. Of all, classical music is definitely built on foundations and levels.
It is said that there is a path of being able to do it all, the ultimate pianist that can play anytime, anywhere, in any style, any duration, on any piano. That is the endpoint.