I'm curious what makes you say this? I feel like I discover how most sufficiently complex apps work by googling, or youtube.

I'm also not convinced this makes traditional methods: walkthroughs, support videos, trainings etc impossible?

My friend just discovered coding agents (lol), and he's constantly finding new things it can do for him...

"Oh it can ssh into my raspberrypi and run the code to test it. Wow"

That was an emergent property of the cli coding agent that had no "traditional" discoverability.