The whole point of lean startup was to route around the bottleneck of development velocity.
It is about designing good experiments, validating, and learning, so that when we're down to development, we build something that's way more likely to succeed.
The fact that we were advised to build non-technical experiments is but a small part. And with the current AI capabilities, we actually have a new power tool for prototyping that falls neatly into the whole puzzle.
Here's a bit more elaborate argument (sorry for a LinkedIn link): https://www.linkedin.com/posts/pawelbrodzinski_weve-already-...
Move faster and move better (to move faster) are the same thing. You reduce costs by going faster, and with lean you go faster by avoiding time wasters.