[derefr]

Technological R&D doesn't get you anywhere on its own. It's an important prerequisite, sure, but just as necessary is the next step, where a company is formed to commercialize/productize novel research through years of schlepping through market education and government safety trials, to pave the way for the technology to become a "safe" product category for other companies to follow on to. There are many technologies stuck between these two stages—thoroughly "researched and developed", but not yet commercialized.

People like Musk (and the people he co-founds these companies with) are important because they're taking nascent product categories that are "stuck" in the R&D stage with little attention being paid to them, and directing large-scale consumer demand onto them in a way that brings profit-driven industry interest—and therefore industry talent—into the picture. Even if it's not Musk's offering that end up winning the space, these efforts redefine the public perception of the category in a way that means that every company in the space wins.

(For another equivalent example: the creator of Bitcoin did more for smart contracts by creating one platform that lead to competitor platforms that actually had smart-contract support, than a thousand academic smart-contract systems projects ever could have.)