Renault introduced/pioneered Turbos, diffusers, exhaust powered diffusers, tuned mass dampers, an the early versions of the distinct front beamwing/cascade thingy made more famous on the MP4 23. Thats all I can think of off the top of my head.
However I take the point, smaller teams are forced to innovate because they don’t have the money for the brute force approach of manufacturors like Honda and Toyota. Try something different occasionaly hit gold, wina load a races, the really good ones, Brabham, Lotus, etc jumped foward every few years, but it’s why they faded so quickly when the geniuses left, without whatever it was that was driving the innovation, the speed goes.
The powerhouses of the modern sport combine comparitvley modest (still massive) budgets with innovative design, a la the f-duct, tuned mass dampers, any number of Rory Byrne, Adrian Newey pirouettes. An this kept them ahead of the super budget teams througout the 00′s.