Off road cycling is its own beast, with the development of specialized bikes for that use, and also the design of trails that challenge both your skill and your technology. But the old footpath through the woods, or gravel road, is still the same as it ever was, and a regular bike handles it just fine.
In the US, there's a perpetual effort by the bike companies to get people out riding, when everybody's already got a nearly brand new bike hanging in the garage. They want to sell new bikes, so of course the silver bullet is new technology. I think the rapid adoption of e-bikes shows that the real barrier was not the detailed performance of particular components, but physical effort. Who knew?
In a lot of cases I think it might be less about effort itself, and more about climate and what the level of effort means in that context. I know where I live half the year the average temperature is 80F or above, and pedaling or not could very well be the difference of showing up as a sweaty mess that needs a shower on site to appear presentable or not.
Is there data on this rapid adoption? I'm not seeing it. It's hard to believe riding a bike is so much effort, but who knows?