In short, we sample the world to ensure our predictions become a self-fulfilling prophecy and surprises are avoided. In this view, perception is enslaved by action to provide veridical predictions (more formally, to make the freeenergy a tight bound on surprise) that guides active sampling of the sensorium.
As an aside - maybe the majority do see the benefits of withheld assent. Maybe it is mostly the chattering classes who assent too readily to fashionable consensus. As this isn't the least action approach their brains overheat.
Withheld assent feels similar to detachment if we see detachment as perpetually withheld assent. We've known about detachment for centuries - where some people seem to prefer to remain outside the easy brainwork of consensus.
All of which seems to fit modern life quite well.