This site has already covered how venture capital became an industry at all -- two 1978/1979 policy decisions that let pension money into the asset class at scale. This is the follow-up question: once that capital was flowing, what did it actually get pointed at?
On July 30, 2011, Peter Thiel's firm Founders Fund published a manifesto with a line that outlived the essay: "We wanted flying cars, instead we got 140 characters."[1] The claim was that venture capital had stopped funding the physical, ambitious, capital-intensive future -- rockets, energy, biology -- and settled for funding "features, widgets, irrelevances."[1] Three weeks later, on August 20, 2011, Marc Andreessen published the opposite argument in the Wall Street Journal: "Why Software Is Eating the World."[2] His case wasn't that hard technology didn't matter -- it was that software was the mechanism by which every other industry, including the physical ones, was about to get restructured. Same summer, same industry, two of its most prominent investors, flatly opposed theses.
So which one turned out to be right? By MaC's count, by the 2000s, 90% of the top 10 most valuable venture-backed companies made software -- Thiel's complaint had real numbers behind it. But looking at 2000 through roughly the last few years as a whole, venture dollars flowed into software companies at about 3x the rate they flowed into hardware -- Andreessen's read that software was where the money and the restructuring both were also had real numbers behind it.[3] The two claims aren't actually contradictory: one is about capital allocation, the other is about which sector's tools ended up rearranging the rest of the economy. Both things happened, at the same time, funded by mostly the same pool of money.
What's changed since is the part neither manifesto could have predicted: deep tech's share of global VC funding was roughly 12% in 2016; by 2026 it had climbed to 36%, per VC firm Celesta's own portfolio research -- nearly a threefold increase in a decade.[4] MaC's count of the top 10 most valuable venture-backed private US companies now includes four hardware-focused ones, up from a low point of essentially zero in the 2000s.[3] Thiel's "flying cars" complaint didn't get answered by anyone changing their mind -- it got answered by capital, over a decade, actually moving.
The honest version of "which industries get support" isn't a single answer -- it's at least three different questions that get collapsed into one. Which sector gets the most deals? Which gets the most dollars? Which sector's few outsized bets produce the founders and companies everyone remembers? Thiel and Andreessen were each answering a different one of those three, in the same summer, without saying so.