The problem is when people assume you can actually build an entire software/service architecture of any complexity just through vibe coding.

Welcome to CEO handling 101. It’s an art, a very soft skill, and not for the faint of heart. I worked for a mid sized (50 employee) company once where I’d “speak truth to power” in our weekly meeting, get shot down rather enthusiastically by the CEO during the meeting, then after I and the rest of R&D left his office, he’d go out to production and have them start implementing all the concepts of my pitch - as his own ideas, naturally.