I disagree, though what you're saying is true I don't think it's the primary reason for why the lean startup model was so effective.
The lean startup mentality was fundamentally a product of the era of entrepreneurship that birthed it, and the market environment for software.
About 10-15 years ago the web was clearly here to stay and maturing, but literally huge problem spaces had been very lightly explored with software. So it made sense to do something, anything, to solve a problem that software was good at, because the alternative was almost always a legacy approach. Which means even an MVP was likely useful for customers. The only real danger was moving too slow.
It's the equivalent of buying up residential real estate in Brooklyn or San Francisco 20 years ago. Or whatever metaphor you prefer, where a market is growing so quickly that nearly all entrants have the ability to thrive if they are at least somewhat aligned with a consumer problem and willingness to pay.
Thing are different now. There's a software solution for almost everything, maybe not a great one but there's something out there. People are overwhelmed and exhausted by their options, have subscription fatigue, and likely have the experience of adopting a fledgling poorly supported MVP type solution that didn't live very long and regretting it.
People are pretty much the same. But the market environment has shifted.
Nobody gives a fuck about your landing page with two sentences and an email capture box any more. The world has moved on from this model.